The Human-Animal Chimera Prohibition Act of 2025 would make it a federal crime to create, transfer, or transport certain types of human-animal hybrids, known as "prohibited human-animal chimeras." The law defines these chimeras broadly to include hybrid embryos created by mixing human and animal genetic material in specific ways, such as fertilizing human eggs with animal sperm, creating embryos with chromosomes from both species, or engineering animals with human brains or facial features. Anyone who violates the law faces up to 10 years in prison and fines; those who profit from such violations face additional civil penalties of at least $1 million or twice their gross gain, whichever is greater. The bill explicitly excludes legitimate medical research such as transgenic animal models with human genes or transplantation of human organs and tissues into animals, ensuring that standard biomedical research is not restricted.
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