GrowthInducers, and Differentiation Inducers. Te blood cells begin their lives in the bone marrow from a single type of cell called the pluripotential hematopoieticstemcell, from which all the cells of the circulating bloodareeventually derived. Figure 33-2 shows the successivedivisions of the pluripotential cells to form the different circulating blood cells. As these cells reproduce, a small portion of them remains exactly like the original pluripo- tential cells and is retained in the bone marrow to main- tain a supply of these, although their numbers diminish with age. Most of the reproduced cells, however, differen- tiate to form the other cell types shown to the right in Figure 33-2. Te intermediate-stage cells are very much like the pluripotential stem cells, even though they have already become committed to a particular line of cells and are called committed stem cells.
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