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Distribution of CK19 in epithelial cells in vivo. Frozen sections of fresh, unfixed human stomach (a–d) and rat small intestine (e and f) were processed for indirect immunofluorescence with anti-CK19 mAb (A53-B/A2); (a and b) stomach, surface epithelium; (c and d) stomach, gland; (e and f) adult rat small intestine, epithelium of villi. Phase contrast images corresponding to a, c, and e, are shown in b, d, and f. Nu indicates the position of two nuclei taken as examples. Bars, 10 μm.
