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Electron microscopy of rat peritoneal mast cells (RPMC). (A) untreated RPMC, (B) & (C) RPMC treated with live trichomonads and 25% ESP of T. vaginalis for 3 h, respectively. Typical mast cell-specific granules (granules filled with electron-dense material) are present in untreated RPMC, which were presumably exocytosed after stimulation by live trichomonad or T. vaginalis ESP. Scale bar: 0.5 μm.
