reproductive system
• although male mice homozygous for this mutation are fertile, only a minority of female homozygotes become pregnant
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behavior/neurological
• of homozygous female mice that do become pregnant, few succeed in weaning their offspring
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integument
• homozygous mutant mice fail to develop a hair coat, remaining naked from birth throughout their lives
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• homozygous mutant mice lack vibrissae from birth onward
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