mortality/aging
• fewer mutant embryos are recovered than Mendelian ratios starting at embryonic day (E)14.5; none are alive at birth
• no perivascular hemorrhages, normal vessels containing nucleated red blood cells, normal vascularization in placenta at E13.5
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cardiovascular system
• decreased number of vessels in the brain, spinal cord and skin at E13.5
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• dilated vessels in the brain, spinal cord and skin at E12.5
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• increased permeability after recombinant adenoviruses encoding Cre infection of endothelial cells in vitro
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cellular
• a slight increase in apoptosis in the liver at E13.5
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