title: Stem cells: the road not taken.
authors.forename: Hanno
authors.initials: H
authors.lastname: Hock
authors.forename: Stuart H
authors.initials: SH
authors.lastname: Orkin
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D019070:Cell Lineage; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000378:metabolism; D006801:Humans; D008214:Lymphocytes / Q000166:cytology* / Q000378:metabolism; D051379:Mice; D022423:Myeloid Cells / Q000166:cytology* / Q000378:metabolism