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Localization of histamine receptors in cultured rat and human goblet cells. Goblet cells from rat (A) and human (B) conjunctiva were grown and fixed, and immunofluorescence experiments were performed with antibodies against the H1 receptor (H1R), H2 receptor (H2R), H3 receptor (H3R), and H4 receptor (H4R). Magnification 200×. Each micrograph is representative of three separate experiments.
