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. 2007 Sep 26;2(9):e945. doi: 10.1371/journal.pone.0000945

Figure 3. A possible dual role for Wnt in the maintenance of stem cell niches.

Figure 3

We hypothesize that Wnt may promote self-renewal directly by raising nuclear ß-Catenin levels in stem cells and indirectly by activating the BMP inhibitor Gremlin 2 in nearby fibroblasts, thereby blocking target BMPs from promoting differentiation and loss of self-renewal capacity.