CATSPER2 (Cation Channel, Sperm Associated 2): CATSPER2 is a protein that forms part of a calcium channel in sperm, essential for sperm motility and fertility. It plays a critical role in enabling the hyperactivated movement required for successful fertilization. Mutations in CATSPER2 can impair sperm function, leading to male infertility. Research on CATSPER2 provides valuable insights into reproductive health, as well as potential targets for contraception and infertility treatments.