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Most normal cells displayed distinct cytoplasmic positivity. Strong staining was seen in glandular cells of gastrointestinal tract, exocrine pancreas, gall bladder, axonal projections, renal tubules, urothelia, endometrial glands, cells in seminiferus ducts and lymphocytes outside reaction center. Hepatocytes, bile ducts and cells of the CNS were negative or weakly stained.