mortality/aging
• mutants are alive at E17.5 but do not survive birth
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craniofacial
• an ectopic arch is associated with the occipital bones
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• the sphenoid is partially split
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• the center of the presphenoid is not ossified
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skeleton
• an ectopic arch is associated with the occipital bones
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• the sphenoid is partially split
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• the center of the presphenoid is not ossified
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• changes in the vertebral column are similar to those in Phc2tm1Hko
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digestive/alimentary system
growth/size/body