cardiovascular system
• at E12.5 the atria are enlarged
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• at E12.5, the hearts are smaller with a disproportionate loss of tissue at the apex of the heart and in the regions around the interventricular groove; however, the patterning of the ventricles, septum, valves, and outflow tract are normal
• double homozygotes are indistinguishable from Fgf9 single homozygotes
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