Stem cells-why wait?
D035843:Biomedical Research; D033041:Embryo Research; D035082:Federal Government; D033161:Government Regulation; D017408:Guidelines as Topic; D018380:Hematopoietic Stem Cell Transplantation / Q000592:standards*; D006801:Humans; D009316:National Institutes of Health (U.S.); D012106:Research / Q000592:standards*; D018570:Risk Assessment; D013234:Stem Cells; D014481:United States