title: What is an embryo?: a comment.
authors.affiliation: Princeton University, USA.
authors.forename: Harold T
authors.initials: HT
authors.lastname: Shapiro
mesh_terms: D033041:Embryo Research; D004622:Embryo, Mammalian; D006801:Humans; D011640:Public Policy; D027724:Reproductive Techniques, Assisted; D012586:Science; D009626:Terminology as Topic; D014481:United States