title: Stem cells: biopsy on frozen embryos.
authors.forename: Peter
authors.initials: P
authors.lastname: Schwartz
mesh_terms: D001706:Biopsy; D015925:Cryopreservation; D033041:Embryo Research / Q000941:ethics; D004622:Embryo, Mammalian; D053595:Embryonic Stem Cells; D005307:Fertilization in Vitro; D006801:Humans