title: Turning back the clock.
mesh_terms: D001675:Bioethics; D019976:Cloning, Organism / Q000331:legislation & jurisprudence*; D016332:Fetal Tissue Transplantation / Q000331:legislation & jurisprudence*; D018380:Hematopoietic Stem Cell Transplantation / Q000331:legislation & jurisprudence; D006801:Humans; D014481:United States