Specifically, triple knockouts of SRC, YES, and FYN result in embryonic lethality, double knockouts of SRC and YES, or SRC and FYN, result in perinatal lethality, and a single knockout of SRC causes postnatal lethality or infertility, but a single knockout of YES or FYN is viable and fertile (11–13). Here, YES1 is linked to Infertility.