The Trump administration has halted the use of human fetal tissue in research funded by the National Institutes of Health (NIH). The policy change marks the end of the last research program that used such tissue from abortions. The administration refused to renew the contract with the University of California, which funded the research program. Fetal tissue has been used in medical research to study various diseases and develop treatment methods. The decision represents a significant turn in American research policy regarding this type of biological material. The change affects all NIH federally funded projects that have worked with this tissue.