integument
• at 5 weeks of age, linear grooves running parallel to longitudinal body axis appear on the coat surface of homozygotes; these are enhanced when hind limbs are strctched backwards
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• upon hair removal, numerous wrinkles are observed in skin of mutants, running parallel to the body, visible when mice are suspended by the tail
• all skin layers are present and there appear to be no defects in epidermal differentiation
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