The thrombopoietin receptor, c-Mpl, is a selective surface marker for human hematopoietic stem cells.

A repeated measures two-way analysis of variance comparing the two variables, (1) tissue source and (2) differentiation stage, indicated that the differences observed in the percentage of c-mpl + cells for the four differentiation stages were highly significant (p < 0.0001) [Table 2 ].

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For each tissue source, a post-test for a linear trend was significant for a decreasing trend from differentiation stage I through stages II, III and IV.

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