CATSPER2 and Infertility: Moreover, the infertility phenotype of patients with homozygous deletion of CATSPER2 (patient C5), homozygous deletion of CATSPER2 combined with heterozygous deletion of STRC and CKMT1B (patients C6–C8), or homozygous deletion of CATSPER2, STRC, and CKMT1B (patients C1–C4) was indistinguishable.