GPR18 is involved in apoptosis, microglial migration in the CNS and other immune responses.

Chemical Name: 
G-protein coupled receptor 18
IUPHAR entry: 
Wikipedia entry: 

GPR18 is found in immune cells and tissues such as: microglia, spleen, testis, thymus, peripheral leukocytes, appendix and lymph nodes and in other tissues such as the small intestine, lung, ovary, testis, thymus, striatum, hypothalamus, thyroid, peripheral blood leukocytes, cerebellum and brain stem.