mortality/aging
• only 5% survive past E9.0 and none survive past E10.5 (maternal genotype is heterozygous for St14tm1Bug and Spint2Gt(KST272)Byg)
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• only 5% survive past E9.0
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embryo
• neural tube defects involving the hindbrain, midbrain and forebrain are seen
• defects are generally observable at E9.5 or earlier
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• the dorsolateral hinge points critical for the final stages of the neural tube closure are absent in 97 percent of embryos
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nervous system
• neural tube defects involving the hindbrain, midbrain and forebrain are seen
• defects are generally observable at E9.5 or earlier
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• the dorsolateral hinge points critical for the final stages of the neural tube closure are absent in 97 percent of embryos
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exencephaly
(
J:188121
)
• 10% of embryos fail to initiate fusion at closure point 2, resulting in exencephaly that extends from forebrain region to the hindbrain cervical boundary
• many embryos that initiate fusion at closure point 2 display exencephaly that spans the entire midbrain and hindbrain regions
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