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Named for Intermediate size vesicles. The identifying hormone (historically) is
Examples of colocalization of hormones and/or their gene transcripts (most of recent data is from mouse):
I cells are located in the proximal small intestine, have the luminal receptors Type 2 taste receptors (T2Rs), G-Protein Coupled Receptor 40 (GPR40), G-Protein Coupled Receptor 120 (GPR120), Lysophosphatidic acid receptor 5 (LPAR5), Calcium-sensing receptor (CaSR), Transient Receptor Potential A1 (TRPA1) Channel, Toll-Like Receptors (TLRs), and release Cholecystokinin (CCK) and 5-HT. They activate gallbladder contraction and the secretion of pancreatic enzymes