title: Stem cells versus stem lines.
mesh_terms: D000818:Animals; D002452:Cell Count; D002454:Cell Differentiation; D002455:Cell Division; D002470:Cell Survival; D002999:Clone Cells; D006410:Hematopoiesis; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D007399:Interphase; D051379:Mice; D013154:Spleen / Q000166:cytology