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Expression of taste receptors (α-gustducin, T1R2, T1R3) were measured in proximal duodenum, proximal jejunum, mid small bowel, and terminal ileum, using qPCR. Both α-gustducin and T1R3 showed topographical variation, peaking in proximal to midsmall bowel. While T1R2 trended towards a regional variation, this did not meet significance.
