1. Short title This Act may be cited as the Human-Animal Chimera Prohibition Act of 2023 . 2. Prohibition on certain human-animal chimeras Part I of title 18, United States Code, is amended by inserting after chapter 51 the following: 52 Certain Types of Human-Animal Chimeras Prohibited Sec. 1131. Definitions. 1132. Prohibition on human-animal chimeras. 1131. Definitions In this chapter: (1) Human embryo The term human embryo means an organism of the species Homo sapiens during the earliest stages of development, from 1 cell up to 8 weeks after conception. (2) Prohibited human-animal chimera The term prohibited human-animal chimera means— (A) a human embryo into which a nonhuman cell or cells (or the component parts thereof) have been introduced to render the embryo’s membership in the species Homo sapiens uncertain; (B) a human-animal embryo produced by fertilizing a human egg with nonhuman sperm; (C) a human-animal embryo produced by fertilizing a nonhuman egg with human sperm; (D) an embryo produced by introducing a nonhuman nucleus into a human egg; (E) an embryo produced by introducing a human nucleus into a nonhuman egg; (F) an embryo containing at least haploid sets of chromosomes from both a human and a nonhuman life form; (G) a nonhuman life form engineered such that human gametes develop within the body of a nonhuman life form; (H) a nonhuman life form engineered such that it contains a human brain or a brain derived wholly or predominantly from human neural tissues; (I) a nonhuman life form engineered such that it exhibits human facial features or other bodily morphologies to resemble human features; or (J) an embryo produced by mixing human and nonhuman cells, such that— (i) human gametes develop within the body of the resultant organism; (ii) it contains a human brain or a brain derived wholly or predominantly from human neural tissues