-Removal of several mitochondrial genes: ATP8 (lost with 7599 bp only), ATP6, cytochrome oxidase (COX) III, cytochrome b (CYB), NADH dehydrogenase (ND) 3,4, 4L, 5, and 6.-Reduction in the obtained energy, which in turn has a negative effect on sperm flagellum movement and leads to asthenozoospermia. Here, MT-CYB is linked to Reduced sperm motility.