title: US stem-cell research expands.
authors: Meredith
authors: M
authors: Wadman
mesh_terms: D002460:Cell Line; D033041:Embryo Research; D017408:Guidelines as Topic; D006801:Humans; D009316:National Institutes of Health (U.S.); D012042:Registries; D013234:Stem Cells / Q000166:cytology; D014481:United States