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Bless you Bob, I have needed these definitions for sometime now. just me, Marjorie At 03:44 PM 10/05/2000 -0500, you wrote: >--------------------------- >Stem cell: An ancestral cell, the most primitive type of >cell. > >Stem cells are relatively unspecialized (undifferentiated) >cells that are characteristically of the same family type >(lineage). They retain the ability to divide throughout life >and give rise to cells that can become highly specialized >and take the place of cells that die or are lost.