Fig. 1

Hairless mice with different levels of skin pigmentation. a Photographs of dorsal skin from wild-type mice (WT) and HL-RET-mice of lines 242 (242) and 304 (304) at 4 months of age are shown. b The skin pigmentation levels (means ± SD, n = 11) in dorsal skin (L* values) are presented. Significant differences (**p < 0.01) were evaluated by the Tukey-Kramer test