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Photomicrograph from the tumor mass of different experimental groups immune-stained with CK. (GIIA, GIIB): Mark brownish cytoplasmic stainability of the malignant cells (blue arrows), (GIII): massive necrosis of the tumor cells with negative staining reaction. Some cells showed hazay cytoplasmic membrane brownish staining reaction (black circle); (GIV): remnants of tumor mass were seen with positive cytokeratin cytoplasmic staining reaction in most of the remaining cells (blue stars).
