title: Does pregnancy begin at fertilization?
authors.forename: Walter L
authors.initials: WL
authors.lastname: Larimore
authors.forename: Joseph B
authors.initials: JB
authors.lastname: Stanford
authors.forename: Chris
authors.initials: C
authors.lastname: Kahlenborn
mesh_terms: D000028:Abortion, Induced / Q000941:ethics / Q000379:methods*; D033421:Beginning of Human Life / Q000941:ethics; D044363:Contraception, Postcoital; D003281:Contraceptives, Postcoital; D033041:Embryo Research; D005260:Female; D005306:Fertilization; D006801:Humans; D011247:Pregnancy; D014481:United States
chemical_list: D003281:Contraceptives, Postcoital