mortality/aging
• some postnatal lethality is observed; homozygous offspring are not present at expected Mendelian ratio (1:1:0.5 whereas expected ratio is 1:2:1)
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growth/size/body
• mice show lower body weight compared to heterozygous and wild-type littermates from birth through adulthood (~15 weeks)
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craniofacial
• some display craniofacial defects
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