mortality/aging
• a level of embryonic death is noted between E13.5 and E18.5
• genotypic distribution at P1 differs from expected 1:2:1
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• immediate postnatal death is observed with some pups
• genotypic distribution at P1 differs from expected 1:2:1
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normal phenotype
• contrary to an earlier report, homozygous mice display no abnormal phenotype
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