Tumor cells were obtained by trypsinization in paraffin-embedded tissues, washed with PBS and fixed in ice-cold 3% glutaraldehyde buffered at pH 7.4 with 0.1 M cacodylate for 24 h. The cells were then fixed in 1.0% OsO4, dehydrated in a progressive ethanol and acetone solution, and embedded in Epon 812 in sequence. Sections (1-μm thick) were cut and stained with uranium tetraacetate followed by lead citrate trihydrate. Subsequently, the sections were observed with a H-600 IV transmission electron microscopy and photographed.
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