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Expression of CCK, CCK-Ar, and CCK-Br proteins in mouse taste bud cells. (A) Coexpression of CCK (green) and CCK-Ar (red) in fungiform (FP) and circumvallate papillae (CV). (B) Coexpression of CCK (red) and CCK-Br (green) in FP and CV. Cells expressing both CCK and CCK receptor are shown in yellow. (C) Immunofluorescent images of CCK-Ar and CCK-Br in CV of CCK-Ar−/− or CCK-Br−/− mice, respectively. Dotted lines indicate the outline of taste buds. Scale bar, 10 μm.
