title: From human embryos, hope for 'spare parts'--but research renews debate over use of fetal cells.
authors: S
authors: S
authors: Begley
mesh_terms: D004622:Embryo, Mammalian / Q000166:cytology*; D004992:Ethics, Medical; D016332:Fetal Tissue Transplantation / Q000331:legislation & jurisprudence* / Q000592:standards; D006801:Humans; D012106:Research; D013234:Stem Cells; D014481:United States