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The angora (go) mouse is an autosomal recessive mutation due to a deletion of ∼2 kb in the Fgf5 gene. Phenotypically, homozygous angora (go/go) mice have excessively long truncal hair and they can be differentiated from heterozygous (go/+) and wild-type (+/+) littermates by 21 days of age. The abnormal hair length is due to a three day prolongation of the anagen phase of the hair cycle. In addition,...