mortality/aging
• 2/3 die before birth
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pigmentation
• hairs show irregular pigmentation and keratinization
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growth/size/body
• variable severity of growth retardation
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integument
• hairs are crooked
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• hairs show irregular pigmentation and keratinization
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• cell proliferation is completely absent in the bulb region and lower part of the outer root sheath of hair follicles
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• vibrissae are either completely absent or produce only short stubby shafts
• cell proliferation is absent in the matrix cells and the outer root sheath of the mid-region of the whiskers
• whiskers are irregular in shape with degenerated layers of sheaths cells and tiny shafts
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• hair follicles fail to initiate a second growth cycle, which leaves shed or lost hair unreplenished and leads to balding with age
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• epidermis response to wax stripping is delayed, with epidermis thickening after 5 days instead of the expected 2 days after wax stripping the hair
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