GIP, a member from the incretin family, secreted from intestinal epithelial K cells, regulates glucose and lipid metabolism as a result of binding to GIP receptors. Offered the broad tissue distribution of GIPR, it is not surprising that GIP actions have already been documented on many tissues other than stomach, https://drive.google.com/drive/folders/19v5zdnKh9DL51CFR2jGZXN3OTiFtBYbV?usp=sharing