title: Preembryo research: history, scientific background, and ethical considerations. ACOG Committee Opinion: Committee on Ethics. Number 136--April 1994.
mesh_terms: D026683:Advisory Committees; D033421:Beginning of Human Life; D033041:Embryo Research; D004622:Embryo, Mammalian; D004989:Ethics; D006801:Humans; D019369:Life; D009014:Morals; D011640:Public Policy; D012106:Research; D018570:Risk Assessment