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Co-culture of HT-29/normal colon epithelial cells incubated with ZnPc-CEA conjugate 2 at 1 μM concentration. (a) Staining with anti-CEA antibody reveals the HT-29 portion of the co-culture. (b) Imaging at 700 nm emission shows association of conjugate 2 with the CEA-expressing cells. (c) TRITC-labeled lectin from U. europaeus identifies mucin glycoproteins, more abundantly expressed on normal colonic epithelial cells
