mortality/aging
• homozygotes are found in mendelian proportions up to birth, however only 4% of the expected 25% are seen around weaning, indicating postnatal lethality
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craniofacial
• variable facial abnormalities
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nervous system
• variable brain reduction from E9.5 on
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• marker analysis shows complete disappearance of the mesencephalon
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• marker analysis shows partial disappearnce of the diencephalon
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growth/size/body
• variable facial abnormalities
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