integument
• with doxycycline induction from P8, hair follicles contain numerous apoptotic cells (more than in mutants with transgenic expression of Dkk1, or Dkk1 and Kremen
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• with doxycline induction from P30, mutants completely lack external hair when examined at P100-102
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• with doxycycline induction from P8 hair follicles in mutants display structural defects at P24, including widened infundibulum and loss of a clearly distinguishable secondary hair germ
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• with doxycycline induction from P8 hair follicles display a widened infundibulum at P24
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• with doxycycline induction from P30, hair follicles are mainly absent in mutants
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• with doxycycline induction from P30, hair follicles degrade and form utricles by P180
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• when doxycline induction is performed at P4 or P7 and dorsal skin harvested at P8 or P14, hair follicles in treated skin show cessation of anagen
• with doxycycline induction from P50 and hair plucking at P54, proliferation of secondary hair germ cells of follicles is decreased or absent and a new hair growth phase is not observed by P57
• with induction from P17 (catagen phase), follicles fail to enter anagen
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• when doxycline induction is performed at P4 or P7 and dorsal skin harvested at P8 or P14, hair follicles in treated skin show entry into a premature regression phase compared to controls
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• dermal papillary cells are observed 'stranded' in the epidermis or at the end of 'streamers' of degenerating hair follicles
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• when doxycline induction is performed from P4 to P60, enlargement of intercellular spaces and some cell membrane protrusions are observed in some areas of mutant skins
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• when doxycline induction is performed from P4 to P60, expansion of the basal layer is observed
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• when doxycline induction is performed from P4 to P60, expansion of the suprabasal layer is observed
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• when doxycline induction is performed from P4 to P60, some keratinocytes display long membranous protrusions
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• when doxycline induction is performed from P4 to P60, epidermis displays thickening and hyperproliferation
• with doxycycline induction from P30, epidermis is thickened at P100
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cellular
• with doxycycline induction from P8, hair follicles contain numerous apoptotic cells (more than in mutants with transgenic expression of Dkk1, or Dkk1 and Kremen
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