1. The “Skinny” on Wnt Signaling in Stem Cells
Bruce A. Morgan 
Cell Stem Cell 
Volume 13, Issue 6, Pages (December 2013)
DOI: /j.stem
Copyright © 2013 Elsevier Inc. Terms and Conditions

2. Figure 1 Stem Cells in the Skin
Epidermal stem cells (purple) generate the superficial layers of the epidermis. Follicular stem cells (dark blue) include the comparatively quiescent bulge cells and the secondary germ cells that regenerate the follicle and abut the dermal papilla (yellow). Insets diagram autocrine Wnt signaling in the epidermis (above) and hair follicle (below). In the hair follicle, Wnts expressed by the stem cells coordinate activation of both stem cells and their niche. In the epidermis, Wnt inhibitors expressed by suprabasal layers may suppress Wnt signaling to regulate stem cell activity.
Cell Stem Cell  , DOI: ( /j.stem )
Copyright © 2013 Elsevier Inc. Terms and Conditions