nervous system
• at E14.5, melanoblasts are absent
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• while Cajal cells are present at birth they are reduced in number by P15
• the number of Cajal cells fails to increase with the expansion of the small intestine area after birth as in wild-type mice
• however, no increase in apoptotis is observed
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• unlike in wild-type mice, the small intestine does not display any slow wave-type action potentials and the membrane resting potential is lower than in wild-type mice
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pigmentation
• mice are black-eyed white with some signs of pigmentation on ears and snout
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embryo
• at E14.5, melanoblasts are absent
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integument
• mice are black-eyed white with some signs of pigmentation on ears and snout
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