Tissues and stem cells.
This brief overview of the different cell populations types contained in the various tissues of the adult organisms, with special reference to cell population hierarchies and kinetic patterns, indicates that not all cell populations have--nor do they need--stem cells; in those which have, the stem cells usually represent a minority subpopulation.
D000818:Animals; D002455:Cell Division; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D006801:Humans; D007700:Kinetics