NIH Renews Funding for Transgender Mice Study After Cutoff

Animal rights group files FOIA lawsuit over controversial UC San Diego research project

Apr. 1, 2026 at 2:24am

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The National Institutes of Health (NIH) has awarded new funding for a controversial study on transgender mice at the University of California, San Diego, after the previous budget period ended. The study, which had been reinstated under a court order last summer, is now facing renewed scrutiny from an anti-animal testing watchdog group that has filed a Freedom of Information Act (FOIA) lawsuit.

Why it matters

The NIH's decision to continue funding this research on transgender identity in mice has reignited the debate around the ethics and scientific validity of using animal models to study complex human traits. Animal rights advocates argue the experiments amount to 'woke pseudoscience', while supporters claim the research could yield important insights.

The details

The UC San Diego study, which examines the biological factors influencing gender identity in mice, had its funding temporarily cut off by the NIH last year. However, a court order reinstated the grant, allowing the research to continue through the end of the initial budget period. With that period now expired, the NIH has elected to provide new funding to extend the project, drawing the ire of an anti-animal testing watchdog group.

  • The UC San Diego study's funding was reinstated under a court order last summer.
  • The initial budget period for the study ended, prompting the NIH to award new funding to continue the research.

The players

National Institutes of Health (NIH)

The primary agency of the United States government responsible for biomedical and public health research.

University of California, San Diego

A public research university located in San Diego, California, where the controversial transgender mice study is being conducted.

Anti-Animal Testing Watchdog Group

An organization that advocates against the use of animals in scientific research and has filed a FOIA lawsuit over the NIH's funding of the transgender mice study.

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What’s next

The anti-animal testing watchdog group has filed a Freedom of Information Act (FOIA) lawsuit to obtain more details about the NIH's decision to renew funding for the transgender mice study.

The takeaway

The NIH's decision to continue funding the controversial transgender mice study at UC San Diego has reignited the debate around the ethics and scientific validity of using animal models to study complex human traits like gender identity. This case highlights the ongoing tensions between the scientific community, animal rights advocates, and policymakers over the appropriate use of animals in biomedical research.