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. Author manuscript; available in PMC: 2008 May 30.
Published in final edited form as: Life Sci. 2007 Feb 12;80(24-25):2248–2252. doi: 10.1016/j.lfs.2007.01.056

Figure 2. Masson-Fontana-stain of skin samples of wild type and M4 mAChR KO mice.

Figure 2

Brown-black color indicates the presence of melanin granules (arrows). Wild type mice formed normally pigmented hair shafts on dpp1, dpp8 and dpp34. The hair follicles of M4R KO mice did not contain melanin at this time points. Magnification x100. Insets provide a close view of the hair follicle pigment localization on dpp8 and dpp34 and non-pigmented hair bulbs, respectively. DP: dermal papillae; WT: wild type; M4R−/−: M4 mAChR KO.