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Most normal tissues showed weak to moderate cytoplasmic positivity. Distinct positivity was observed in endothelial cells and plasma. Surface epithelial cells of bronchus, alveolar macrophages, decidual cells in placenta and glandular cells of thyroid and endometrium also showed strong cytoplasmic staining. Liver, squamous epithelia, non-neuronal cells of the CNS, breast, follicle cells of lymphoid tissues and smooth muscle cells were in general negative.