Representative dorsal hair samples from 5-week-old female mice of the C57BL/6J strain (wild type), congenic mice homozygous for the mutant alleles Tyrc (albino), Oca2p-un (pink-eyed unstable), Pldnpa (pallid), Hps3coa (cocoa) or Ap3b1pe (pearl), and homozygous double mutants generated in this study. The genotypes of hair samples (a-c) are indicated on the top, and those of samples (g-i) are indicated on the bottom. The double mutants are: Pldnpa; Oca2p-un (d), Hps3coa; Oca2p-un (e), and Oca2p-un; Ap3b1pe (f).