The function of ENSG00000183560 (IZUMO1R, IZUMO1 receptor, JUNO) is as follows. Receptor for IZUMO1 present at the cell surface of oocytes (oolemma), which is essential for species-specific gamete recognition and fertilization. The IZUMO1:IZUMO1R/JUNO interaction is a necessary adhesion event between sperm and egg that is required for fertilization but is not sufficient for cell fusion (PubMed:30517645). The ligand- receptor interaction probably does not act as a membrane 'fusogen'. Does not bind folate. {ECO:0000250|UniProtKB:Q9EQF4, ECO:0000269|PubMed:30517645}.