This finding suggests that a deficiency in electron transfer activity of MCI in the infertile subjects may account for the increase in mitochondrial ROS (superoxide) production, as shown by Ruiz‐Pesini et al. 22 who reported a decrease in NADH dehydrogenase activity of MCI at electron transport, measured by monitoring the reduction in ferricyanide in sperm from A subjects. Here, ENSG00000254051 is linked to Infertility.