title: Stem cell crunch time.
authors.forename: Nigel
authors.initials: N
authors.lastname: Williams
mesh_terms: D035843:Biomedical Research / Q000941:ethics* / Q000331:legislation & jurisprudence*; D002410:Catholicism; D004622:Embryo, Mammalian / Q000166:cytology*; D033161:Government Regulation; D006801:Humans; D011057:Politics; D039901:Totipotent Stem Cells; D014481:United States