Figure 6.

Possible explanations for the isolation of progenitor cells from developed kidneys. (1) and (2): Isolation of resident progenitors, for example, kidney MSCs (1, blue) or hemato-vascular progenitors (2, pink). (3): Isolation of a stromal progenitor cell (brown). (4): Isolation of a fully differentiated cell type (green) that acquires some progenitor properties on in vitro culturing (demonstrated by the transition in the culture dish into an orange cell type). (5): Isolation of tubular progenitors with a more restricted potential (orange).