title: In search of stem cells.
authors.forename: S
authors.initials: S
authors.lastname: Begley
mesh_terms: D002460:Cell Line; D019049:Developed Countries; D004622:Embryo, Mammalian / Q000166:cytology*; D006801:Humans; D009316:National Institutes of Health (U.S.); D012106:Research; D013234:Stem Cells / Q000166:cytology; D014481:United States