title: Stem cells and lineage plasticity: the challenge to existing paradigms.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D019070:Cell Lineage; D005333:Fetus / Q000166:cytology; D006410:Hematopoiesis; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D006801:Humans; D008214:Lymphocytes / Q000166:cytology; D039904:Pluripotent Stem Cells / Q000166:cytology