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A tiny fern with a big secret just got into the Guinness Book of World Records

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A tiny fern with a big secret just got into the Guinness Book of World Records

Tmesipteris oblanceolata is an obscure species of fork fern found in New Caledonia, a French territory in the South Pacific. Just 4 to 6 inches tall, the humble plant is, in one particular way, the most remarkable living thing in the world.

“You would walk over it. You might even tread on it without knowing it,” said Ilia Leitch, a plant evolutionary biologist and senior research leader at the U.K.’s Royal Botanic Gardens, Kew. “But it houses within it this great secret.”

Recently, T. oblanceolata entered the Guinness Book of World Records after a team of scientists determined that the wispy fern has the biggest known genome of any living organism. Crammed into the nucleus of every one of its cells are 160.45 billion base pairs — 160.45 billion rungs on the twirling double-helix ladder that is the plant’s DNA.

T. oblanceolata has more genes than the mighty California redwood (Sequoia sempervirens) or the massive blue whale (Balaenoptera musculus). It has 50 times more DNA than Homo sapiens, the species that figured out what DNA is in the first place. The findings were published in the journal iScience.

“We were absolutely astonished when we found out how big this genome was,” said botanist Jaume Pellicer of Institut Botànic de Barcelona in Spain, a co-author of the study along with Leitch. “We already knew about the existence of giant genomes in the genus but did not anticipate that the one in Tmesipteris oblanceolata was going to beat any previous records.”

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A genome contains all the information cells need to direct the growth and development of the organism. But life doesn’t offer up instructions in the tidy, more-steps-equals-more-complexity way of Ikea or Lego assembly manuals — hence petite ferns with jumbo-sized genetic codes.

A fern with tiny yellow seeds
A view of fern fronds

You might step on T. oblanceolata “without knowing it,” a plant evolutionary biologist said. (Photographs by Pol Fernandez and Oriane Hidalgo)

Measuring genome size is “not a way to measure genome complexity or coding capacity,” said Elliot Meyerowitz, a Caltech biologist who was not involved in the research.

Only a minuscule sliver of the genetic material that most plant and animal cells lug around actually contains direct instructions for how to make the building blocks that make up living things. Less than 2% of the human genome actually codes for proteins. For the fork fern, the research team estimates that less than 1% of its genome does.

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The rest is known as noncoding DNA. Understanding what that noncoding genetic material does and why cells haul it around are among the biggest questions in evolutionary biology.

Half a century ago, scientists dismissed this noncoding stuff as “junk DNA,” a term now considered “a reflection of our own ignorance,” Leitch said.

It’s not that it all does nothing, she said. We just don’t yet understand everything that it does.

T. oblanceolata ferns grow amid tangled branches and fallen leaves.

T. oblanceolata ferns grow amid tangled branches and fallen leaves.

(Jaume Pellicer)

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In recent years, researchers have found that manipulating or deleting some of these noncoding sequences affect gene expression. This suggests that at least some of this material plays a role in the processes that “switch” genes on and off, “like the conductor of an orchestra, saying who comes in here and who should be quiet here,” Leitch said.

This intricate choreography of gene expression is how we get the incredible diversity within our own species and across the kingdoms of living things.

“Understanding how these genomes function and are structured represents the ultimate milestone in this field of research,” Pellicer wrote in an email. “But for now, it is like trying to read a book of instructions without even knowing where page one is!”

T. oblanceolata displaces the previous genome record holder, a modestly sized flowering plant called Paris japonica that has 149 billion base pairs. While there may be something else out there packing a bigger genetic punch, botanists believe these plants are at the upper end of how much DNA a living thing can have.

A man in a jacket next to a tree, surrounded by ferns and other foliage

A researcher looks for fork ferns in New Caledonia.

(Oriane Hidalgo)

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“If it’s not the biggest, it’s jolly well close to it,” Leitch said of the fork fern’s genome. “There are so many consequences associated with having so much DNA that I think we’re at the limits of what biology can cope with.”

An organism has to divide its cells in order to grow, and before it can do that it has to make a copy of all the DNA in its cells. Copying a colossal genome is a big investment of time, energy and nutrients, Leitch pointed out. For plants, bigger genomes are associated with slower growth and less efficient photosynthesis.

As a result, organisms with massive genomes tend to be found in stable environments without much competition, Leitch said. That’s true of T. oblanceolata, slow-growing Paris japonica and the marbled lungfish, holder of the animal kingdom’s largest genome (nearly 130 billion base pairs).

Unfortunately for T. oblanceolata, stable conditions are increasingly hard to come by in a rapidly changing climate.

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“As long as they’re stable, as long as things don’t change, selection won’t weed them out, so to speak,” Leitch said. “I would predict that if the environment changed, they would not be in a good position.”

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After rash of overdose deaths, L.A. banned sales of kratom. Some say they lost lifeline for pain and opioid withdrawal

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After rash of overdose deaths, L.A. banned sales of kratom. Some say they lost lifeline for pain and opioid withdrawal

Nearly four months ago, Los Angeles County banned the sale of kratom, as well as 7-OH, the synthetic version of the alkaloid that is its active ingredient. The idea was to put an end to what at the time seemed like a rash of overdose deaths related to the drug.

It’s too soon to tell whether kratom-related deaths have dissipated as a result — or, really, whether there was ever actually an epidemic to begin with. But many L.A. residents had become reliant on kratom as something of a panacea for debilitating pain and opioid withdrawal symptoms, and the new rules have made it harder for them to find what they say has been a lifesaving drug.

Robert Wallace started using kratom a few years ago for his knees. For decades he had been in pain, which he says stems from his days as a physical education teacher for the Glendale Unified School District between 1989 and 1998, when he and his students primarily exercised on asphalt.

In 2004, he had arthroscopic surgery on his right knee, followed by varicose vein surgery on both legs. Over the next couple of decades, he saw pain-management specialists regularly. But the primary outcome was a growing dependence on opioid-based painkillers. “I found myself seeking doctors who would prescribe it,” he said.

He leaned on opioids when he could get them and alcohol when he couldn’t, resulting in a strain on his marriage.

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When Wallace was scheduled for his first knee replacement in 2021 (he had his other knee replaced a few years later), his brother recommended he take kratom for the post-surgery pain.

It seemed to work: Wallace said he takes a quarter of a teaspoon of powdered kratom twice a day, and it lets him take charge of managing his pain without prescription painkillers and eases harsh opiate-withdrawal symptoms.

He’s one of many Angelenos frustrated by recent efforts by the county health department to limit access to the drug. “Kratom has impacted my life in only positive ways,” Wallace told The Times.

For now, Wallace is still able to get his kratom powder, called Red Bali, by ordering from a company in Florida.

However, advocates say that the county crackdown on kratom could significantly affect the ability of many Angelenos to access what they say is an affordable, safer alternative to prescription painkillers.

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Kratom comes from the leaves of a tree native to Southeast Asia called Mitragyna speciosa. It has been used for hundreds of years to treat chronic pain, coughing and diarrhea as well as to boost energy — in low doses, kratom appears to act as a stimulant, though in higher doses, it can have effects more like opioids.

Though advocates note that kratom has been used in the U.S. for more than 50 years for all sorts of health applications, there is limited research that suggests kratom could have therapeutic value, and there is no scientific consensus.

Then there’s 7-OH, or 7-Hydroxymitragynine, a synthetic alkaloid derived from kratom that has similar effects and has been on the U.S. market for only about three years. However, because of its ability to bind to opioid receptors in the body, it has a higher potential for abuse than kratom.

Public health officials and advocates are divided on kratom. Some say it should be heavily regulated — and 7-OH banned altogether — while others say both should be accessible, as long as there are age limitations and proper labeling, such as with alcohol or cannabis.

In the U.S., kratom and 7-OH can be found in all sorts of forms, including powder, capsules and liquids — though it depends on exactly where you are in the country. Though the Food and Drug Administration has recommended that 7-OH be included as a Schedule 1 controlled substance under the Controlled Substances Act, that hasn’t been made official. And the plant itself remains unscheduled on the federal level.

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That has left states, counties and cities to decide how to regulate the substances.

California failed to approve an Assembly bill in 2024 that would have required kratom products to be registered with the state, have labeling and warnings, and be prohibited from being sold to anyone younger than 21.

It would also have banned products containing synthetic versions of kratom alkaloids. The state Legislature is now considering another bill that basically does the same without banning 7-OH — while also limiting the amount of synthetic alkaloids in kratom and 7-OH products sold in the state.

“Until kratom and its pharmacologically active key ingredients mitragynine and 7-OH are approved for use, they will remain classified as adulterants in drugs, dietary supplements and foods,” a California Department of Public Health spokesperson previously told The Times.

On Tuesday, California Gov. Gavin Newsom announced that the state’s efforts to crack down on kratom products has resulted in the removal of more than 3,300 kratom and 7-OH products from retail stores. According to a news release from the governor’s office, there has been a 95% compliance rate from businesses in removing the products.

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(Los Angeles Times photo illustration; source photos by Getty Images)

Newsom has equated these actions to the state’s efforts in 2024 to quash the sale of hemp products containing cannabinoids such as THC. Under emergency state regulations two years ago, California banned these specific hemp products and agents with the state Department of Alcoholic Beverage Control seized thousands of products statewide.

Since the beginning of 2026, there have been no reported violations of the ban on sales of such products.

“We’ve shown with illegal hemp products that when the state sets clear expectations and partners with businesses, compliance follows,” Newsom said in a statement. “This effort builds on that model — education first, enforcement where necessary — to protect Californians.”

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Despite the state’s actions, the Los Angeles County Board of Supervisors is still considering whether to regulate kratom, or ban it altogether.

The county Public Health Department’s decision to ban the sale of kratom didn’t come out of nowhere. As Maral Farsi, deputy director of the California Department of Public Health, noted during a Feb. 18 state Senate hearing, the agency “identified 362 kratom-related overdose deaths in California between 2019 and 2023, with a steady increase from 38 in 2019 up to 92 in 2023.”

However, some experts say those numbers aren’t as clear-cut as they seem.

For example, a Los Angeles Times investigation found that in a number of recent L.A. County deaths that were initially thought to be caused by kratom or 7-OH, there wasn’t enough evidence to say those drugs alone caused the deaths; it might be the case that the danger is in mixing them with other substances.

Meanwhile, the actual application of this new policy seems to be piecemeal at best.

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The county Public Health Department told The Times it conducted 2,696 kratom-related inspections between Nov. 10 and Jan. 27, and found 352 locations selling kratom products. The health department said the majority stopped selling kratom after those inspections; there were nine locations that ignored the warnings, and in those cases, inspectors impounded their kratom products.

But the reality is that people who need kratom will buy it on the black market, drive far enough so they get to where it’s sold legally or, like Wallace, order it online from a different state.

For now, retailers who sell kratom products are simply carrying on until they’re investigated by county health inspectors.

Ari Agalopol, a decorated pianist and piano teacher, saw her performances and classes abruptly come to a halt in 2012 after a car accident resulted in severe spinal and knee injuries.

“I tried my best to do traditional acupuncture, physical therapy and hydrocortisone shots in my spine and everything,” she said. “Finally, after nothing was working, I relegated myself to being a pain-management patient.”

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She was prescribed oxycodone, and while on the medication, battled depression, anhedonia and suicidal ideation. She felt as though she were in a fog when taking oxycodone, and when it ran out, ”the pain would rear its ugly head.” Agalopol struggled to get out of bed daily and could manage teaching only five students a week.

Then, looking for alternatives to opioids, she found a Reddit thread in which people were talking up the benefits of kratom.

“I was kind of hesitant at first because there’re so many horror stories about 7-OH, but then I researched and I realized that the natural plant is not the same as 7-OH,” she said.

She went to a local shop, Authentic Kratom in Woodland Hills, and spoke to a sales associate who helped her decide which of the 47 strains of kratom it sold would best suit her needs.

Agalopol currently takes a 75-milligram dose of mitragynine, the primary alkaloid in kratom, when necessary. It has enabled her to get back to where she was before her injury: teaching 40 students a week and performing every weekend.

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Agalopol believes the county hasn’t done its homework on kratom. “They’re just taking these actions because of public pressure, and public pressure is happening because of ignorance,” she said.

During the course of reporting this story, Authentic Kratom has shut down its three locations; it’s unclear if the closures are temporary. The owner of the business declined to comment on the matter.

When she heard the news of the recent closures, Agalopol was seething. She told The Times she has enough capsules of kratom for now, but when she runs out, her option will have to be Tylenol and ibuprofen, “which will slowly kill my liver.”

“Prohibition is not a public health strategy,” said Jackie Subeck, executive director of 7-Hope Alliance, a nonprofit that promotes safe and responsible access to 7-OH for consumers, at the Feb. 18 Senate hearing. “[It’s] only going to make things worse, likely resulting in an entirely new health crisis for Californians.”

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There were 13 full-service public health clinics in L.A. County. Now there are 6

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There were 13 full-service public health clinics in L.A. County. Now there are 6

Because of budget cuts, the Los Angeles County Department of Public Health has ended clinical services at seven of its public health clinic sites.

As of Feb. 27, the county is no longer providing services such as vaccinations, sexually transmitted infection testing and treatment, or tuberculosis diagnosis and specialty TB care at the affected locations, according to county officials and a department fact sheet.

The sites losing clinical services are Antelope Valley in Lancaster; the Center for Community Health (Leavy) in San Pedro, Curtis R. Tucker in Inglewood, Hollywood-Wilshire, Pomona, Dr. Ruth Temple in South Los Angeles, and Torrance. Services will continue to be provided by the six remaining public health clinics, and through nearby community clinics.

The changes are the result of about $50 million in funding losses, according to official county statements.

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“That pushed us to make the very difficult decision to end clinical services at seven of our sites,” said Dr. Anish Mahajan, chief deputy director of the L.A. County Department of Public Health.

Mahajan said the department selected clinics with relatively lower patient volumes. Over the last month, he said, the department has sent letters to patients about the changes, and referred them to unaffected county clinics, nearby federally qualified health centers or other community providers. According to Mahajan, for tuberculosis patients, particularly those requiring directly observed therapy, public health nurses will continue visiting patients.

Public health clinics form part of the county’s healthcare safety net, serving low-income residents and those with limited access to care. Officials said that about half of the patients the county currently sees across its clinics are uninsured.

Mahajan noted that the clinics were established decades ago, before the Affordable Care Act expanded Medi-Cal coverage and increased the number of federally qualified health centers. He said that as more residents gained access to primary care, utilization at some county-run clinics declined.

“Now that we have a more sophisticated safety net, people often have another place to go for their full range of care,” he said.

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Still, the closures have unsettled providers who work closely with local vulnerable populations.

“I hate to see any services that serve our at-risk and homeless community shut down,” said Mark Hood, chief executive of Union Rescue Mission in downtown Los Angeles. “There’s so much need out there, so it always is going to create hardship for the people that actually need the help the most.”

Union Rescue Mission does not receive government funding for its healthcare services, Hood said. The mission’s clinics are open not only to shelter guests, up to 1,000 people nightly, but also to people living on the streets who walk in seeking care.

Its dental clinic alone sees nearly 9,000 patients a year, Hood said.

“We haven’t seen it yet, but I expect in the coming days and weeks we’ll see more people coming through our doors looking for help,” he said. “They’re going to have to find help somewhere.” Hood said women experiencing homelessness are especially vulnerable when preventive care, including sexual and reproductive health services, becomes harder to access.

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County officials said staffing impacts so far have been managed through reassignment rather than layoffs. Roughly 200 to 300 positions across the department have been eliminated amid funding cuts, officials said, though many were vacant. About 120 employees whose positions were affected have been reassigned; according to Mahajan, no one has been laid off.

The clinic closures come amid broader fiscal uncertainty. Mahajan said that due to the Trump administration’s “Big Beautiful Bill,” Los Angeles County could lose $2.4 billion over the next several years. That funding, he said, supports clinics, hospitals and community clinic partners now absorbing patients who previously went to the clinics that closed on Feb. 27.

In response, the L.A. County Board of Supervisors has backed a proposed half-cent sales tax measure that would generate hundreds of millions of dollars annually for healthcare and public health services. Voters are expected to consider the measure in June.

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Mobile clinic brings mammograms to women on Skid Row

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Mobile clinic brings mammograms to women on Skid Row

Sharon Horton stepped through the door of a sky-blue mobile clinic and onto a Skid Row sidewalk. She wore a yellow knit beanie, gold hoop earrings and the relieved grin of a woman who has finally checked a mammogram off her to-do list.

It had been years since her last breast cancer screening procedure. This one, which took place in City of Hope’s Cancer Prevention and Screening mobile clinic, was faster and easier. The staff was kind. The machine that X-rayed her breast was more comfortable than the cold hard contraption she remembered.

Relatively speaking, of course — it was still a mammogram.

“It’s like, OK, let me go already!” Horton, 68, said with a laugh.

The clinic was parked on South San Pedro Street in front of Union Rescue Mission, the nonprofit shelter where Horton resides. Within a week, City of Hope, a cancer research hospital, would share the results with Horton and Dr. Mary Marfisee, the mission’s family medical services director. If the mammogram detected anything of concern, they’d map out a treatment plan from there.

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Naureen Sayani, 47, a resident of Union Rescue Mission, left, discusses her medical history with Adriana Galindo, a medical assistant, before getting a mammogram on last week.

(Kayla Bartkowski / Los Angeles Times)

“It’s very important to take care of your health, and you need to get involved in everything that you can to make your life a better life,” said Horton, who is looking forward to a forthcoming move into Section 8 housing.

Horton was one of the first patients of a new women’s health initiative from UCLA’s Homeless Healthcare Collaborative at Union Rescue Mission. Staffed by third-year UCLA Medical School students and led by Marfisee, a UCLA assistant clinical professor of family medicine, the clinic treats mission residents as well as unhoused people living in the surrounding neighborhood.

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The new cancer screening project arrives at a time of dire financial pressures on county public health services.

Citing rising costs and a $50-million reduction in federal, state and local grant and contract income, the Los Angeles County Department of Public Health on Feb. 27 ended services at seven of 13 public clinics that provide vaccines, tests and treatment for sexually transmitted diseases and other services to housed and unhoused county residents.

Although Union Rescue Mission’s own funding comes mainly from private sources and is less imperiled by public cuts, the 135-year-old shelter expects the need for its services to rise, Chief Executive Mark Hood said.

Even as unsheltered homelessness declined for the last two years across Los Angeles County, the unsheltered population on Skid Row — long seen as the epicenter of the region’s homelessness crisis — grew 9% in 2024, the most recent year for which census data are available.

For many local women navigating daily concerns over housing, food and personal safety, “their own health is not a priority,” Marfisee said.

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Those whose problems have become too serious to ignore face daunting obstacles to care. Marfisee recalled one patient who came to her with a lump in her breast and no identification.

In order to get a mammogram, Marfisee explained, the woman first needed to obtain a birth certificate, and then a state-issued identification card. Then she needed to enroll in Medi-Cal. After that, clinic staff helped her find a primary care physician who could order the imaging test.

Given the barriers to preventative care, homeless women die from breast cancer at nearly twice the rate of securely housed women, a 2019 study found. Marfisee’s own survey of the mission’s female residents found that nearly 90% were not up to date on recommended cancer screenings like mammograms and pap smears, which detect early cervical cancer.

To address this gap, Marfisee — a dogged patient advocate — reached out to City of Hope. The Duarte-based research and treatment center unveiled in March 2024 its first mobile cancer screening clinic, a moving van-sized clinic on wheels that it deploys to food banks and health centers, as well as to companies offering free mammograms as an employee benefit.

“In true Dr. Mary fashion, she saw the vision,” said Jessica Thies, the mobile screening program’s regional nursing director. After working through some logistical hurdles, the mission and City of Hope secured a date for the van’s first visit.

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The next challenge was getting the word out to patients. Marfisee and her students walked through the surrounding neighborhood, went cot to cot in the women’s dorm and held two informational sessions in December and January to answer patients’ questions.

At the sessions, the team walked through the basics of who should get a mammogram (women age 40 or older, those with a family history of breast cancer) and the procedure itself. (“Like a tortilla maker?” one woman asked skeptically after hearing a description of the mammography unit.)

The medical students were able to dispel rumors some women had heard: The test doesn’t damage breast tissue, nor do the X-rays increase cancer risk. Others questioned a mammogram’s value: What good was it knowing they had cancer if they couldn’t get follow-up care?

On this latter point, Marfisee is determined not to let patients fall through the cracks.

Thirteen patients received mammograms at the van’s first visit on Wednesday. Within a week, City of Hope will contact patients with their results and send them to Marfisee and her team. She is already mentally mapping the next steps should any patient have a situation that requires a biopsy or further imaging: working with their case manager at the mission, calling in favors, wrangling with any insurance the patient might have.

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“It’ll be a good fight,” Marfisee said, as residents in the adjacent cafeteria carried trays of sloppy joes and burgers to their lunch tables. “But we’ll just keep asking for help and get it done.”

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