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Competitive inhibition of d-Trp-OPE-stimulated CCK receptor internalization by coexpressing intracellular domain peptides. Representative fluorescence images show Alexa-d-Trp-OPE internalization after occupation of rCCK1R expressed on CHO-CCK1R cells coexpressing IL1, IL2, IL3N, and IL3C. Images are typical of data observed in 3 independent experiments. Scale bar, 20 μm.
