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Electron microscopy of Snx1-/-;Snx2-/- yolk-sac visceral endoderm. (A and B) Electron microscopy of normal control (N, Snx1+/+;Snx2+/+) and mutant (M, Snx1-/-;Snx2-/-) visceral endoderm. The apical microvilli (mv) and yolk-sac cavity (ysc) are labeled. (C and D) Wild-type and mutant apical visceral endoderm at higher magnification. Numerous apical electron dense compartments (arrows) are seen in the mutant images.
