Criteria creep.
D000818:Animals; D002460:Cell Line; D053595:Embryonic Stem Cells / Q000166:cytology; D035082:Federal Government; D006801:Humans; D051379:Mice; D009316:National Institutes of Health (U.S.) / Q000191:economics / Q000331:legislation & jurisprudence; D039904:Pluripotent Stem Cells / Q000166:cytology; D012042:Registries; D014481:United States