mortality/aging
• present at expected numbers at E16.5
• 30% die in utero before birth when Cdkn1ctm1Sje is maternally inherited
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• half expected numbers survive to 2 weeks of age
• Background Sensitivity: significant improvement in survival beyond day 1 of heterozygotes inheriting a maternal mutant when on an outbred CD1 background
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endocrine/exocrine glands
• significantly enlarged and displaying cytomegaly
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cellular
• paternal allele is transcriptionally repressed
• no abnormal phenotype in crosses between heterozygous males and wild-type females
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