For instance, this includes a decrease of components of major mitochondrial processes such as the citrate/TCA cycle and the electron transport chain [63]: vitamin A deficiency decreased the abundances of the succinyl-coenzyme A synthetase beta subunit ScsbetaA, the succinate dehydrogenase subunit A SdhA, the citrate synthase Kdn, and the ATP synthase beta subunit ATPsynbeta (Figure 4A and Figure 6, Table S1). This evidence concerns the gene SUCLA2 and vitamin A deficiency.