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Co-staining with anti- FcεRI α-chain (red) and anti-keratin 8 antibodies (green) verifies the epithelial expression of FcεRI in (A) the crypts of small intestinal section, where FcεRIα is found primarily in the supranuclear region, in (B) colon tissue and in (C) tumor sample of cancer patient No. 16. (D) Negative control with mouse IgG2b and rabbit IgG. The blue fluorescence DAPI staining indicates the nuclei. Original magnification ×40.
