Black spotting mouse spontaneously arisen from the bw mouse.

<p>Appearance of bw mice (A) and black spotting mice (B). The newborn mice shown are 9 days old. (C) Pigmented hair follicles are present at a black patch of the black spotting mouse (30 days old). Middle image shows Dct/DAPI double staining. Expression of Dct (green signals) was detected in follicular melanocytes. Note that melanocytes are present in pigmented hair follicles. Scale bar, 200 μm.