GLP1R (Glucagon-Like Peptide 1 Receptor): GLP1R is a receptor for the hormone GLP-1, which plays a key role in regulating insulin secretion and glucose metabolism. When activated by GLP-1 or its analogs, GLP1R enhances insulin release, reduces glucagon secretion, and promotes feelings of fullness, making it an important target in treatments for type 2 diabetes and obesity.