mortality/aging
• all die around E9.5
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embryo
• the basement membrane is absent
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• abnormal type IV collagen staining
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nervous system
• the basement membrane is absent
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cardiovascular system
• the basement membranes are absent, the endoplasmic reticulum is dilated, apoptosis is increased, and ruptures of the endothelial cell layer are seen
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• dilated blood vessels especially around the sinus venosus
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growth/size/body
muscle
• dilated blood vessels especially around the sinus venosus
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cellular
• the basement membranes of the neural tube and vascular endothelial cells are absent
• type IV collagen is seen inside the cells rather than in the basement membrane
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