integument
• severe and progressive hair loss
• first body coat fully grown by day 16, curly
• alopecia apparent after second follicle generation
• sparse coat on trunk, less so in facial region
• hair reduced ventrally, sparse on hindlimbs and around genital area
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• dorsal alopecia is patchy
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• bent and twisted
• uniform hair diameter and round cross section
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• frequent kinks and twists of the cortex
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• round rather than bean-shaped large shafted hair follicles flanked by two zig-zag hair follicles
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• keratinization in Henle's layer of the inner root sheath either discontinuous or absent
• absence of normal intermediate filament bundles in Henle's and Huxley's layers of the inner root sheath
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• curly vibrissae by day 9 after birth
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