mortality/aging
• homozygotes thrive initially after birth, but become visibly runted by day 7, and appear emaciated with the majority dying before 3 weeks of age; lethality appears to be completely penetrant
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growth/size/body
• mice fail to gain weight at normal rate after birth, becoming runted and appearing emaciated after day 7
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• mice fail to gain weight and grow after birth;
• before birth, homozygotes appear normal and display no defects in development or organogenesis
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