G protein-coupled receptor 3 (GPR3) is a constitutively active lysophospholipid/lysosphingolipid receptor. GPR3 receptor is a link in communication between the somatic cells and oocyte of the ovarian follicle where GPR3 maintains meiotic arrest in mouse oocytes. Oocytes from Gpr3 knockout mice resume meiosis within antral follicles, independently of an increase in luteinizing hormone, and mice deficient in GPR3 exhibit premature ovarian failure due to early oocyte aging (Ledent et al. 2005). References: The UniProt Consortium. Nucleic Acids Res. 47: D506-515 (2019); Nucleic Acids Res. 2016 Jan 4;44(D1):D733-45, PMID:26553804