PTGER3 (Prostaglandin E Receptor 3): PTGER3 is a gene that encodes one of the four receptors for prostaglandin E2, a lipid compound involved in various physiological processes such as inflammation, gastric mucosal protection, and smooth muscle function. This receptor plays a key role in mediating cellular responses to prostaglandin E2, affecting pain perception, fever response, and may contribute to cancer progression and inflammatory diseases.