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By using four distinct monoclonal antibodies to CEA, the molecular profile of which was clarified in our accompanying companion paper, immunohistochemical distribution of the antigenic determinants on both cancerous and noncancerous tissues as well as fetal tissues was studied with the use of the immunoperoxidase method. All of the monoclonal antibodies recognize different antigenic determinants on the tissue section. None of the antibodies stained granulocytes in the peripheral blood or in the normal liver tissues tested. Three of our monoclonal antibodies stained columnar epithelial cells in morphologically normal colonic mucosa; however, monoclonal antibody YK024 did not stain them. This antibody was also found to be unreactive with intestinal metaplasia lesions of the stomach, but reacted with a 16-wk-old fetal stomach as well as with cancerous parts of the colon and of the stomach. Moreover, it was found that this monoclonal antibody mainly reacted with moderately or poorly differentiated adenocarcinoma lesions of the colon and the stomach. Periodic acid treatment in this study, together with trypsin treatment on the antigen as described in our accompanying companion paper, may suggest that this antibody recognizes the carbohydrate antigenic determinant in nature.
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