Mice were fixed in 4% paraformaldehyde in PBS solution by perfusion fixation. Tissue samples were collected and fixed in phosphate-buffered 2.5% glutaraldehyde (pH 7.4), post osmicated, and dehydrated with graded alcohol. After immersion in propylene oxide, the specimens were embedded in Epon 812. Ultrathin sections were prepared and collected on electron microscopic grids and examined with a transmission electron microscope (JEM-1011; JEOL).
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