title: A more astonishing hypothesis.
authors: National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA. mckayr@ninds.nih.gov.
authors: Ron
authors: R
authors: McKay
mesh_terms: D000818:Animals; D001921:Brain / Q000166:cytology; D002454:Cell Differentiation; D002459:Cell Fusion; D002999:Clone Cells; D004622:Embryo, Mammalian / Q000166:cytology*; D004625:Embryo, Nonmammalian; D006412:Hematopoietic Stem Cells / Q000502:physiology*