mortality/aging
• 3-times fewer than expected mutants are produced
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craniofacial
• 4 of 5 mutants display severely hypoplastic frontonasal prominences similar to defects seen in severely affected Ndst1tm1.1Grob single homozygotes
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• 4 of 5 mutants display severely hypoplastic maxillary prominences similar to defects seen in severely affected Ndst1tm1.1Grob single homozygotes
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nervous system
• all mutants display collapse of the midbrain
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• all mutants display collapse of the forebrain
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