United States of America
Cytokeratin
Tonsil. The squamous mucosa show a strong and diffuse cytoplasmic staining reaction in all cell layers. The interdigitating reticulum cells of the lymphoid tissue can be positive.
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Seminoma. Focally, some neoplastic cells show a moderate cytoplasmic staining reaction, while the vast majorities are entirely nega-tive.
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Merkel cell tumor. Some neoplastic cells show a focal and dot-like cytoplasmic staining reaction for cytokeratin.
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Liver. The majority of the liver cells show a moderate predominantly membranous staining reaction, and the bile duct epithelial cells show a strong cytoplasmic staining reaction.
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