Western blots demonstrated that the expression levels of these enzyme subunits (NDUFS3 of complex I, SDHA of complex II, UQCRC2 of complex III, COX-2 of complex IV, and ATPB of complex V) were slightly increased in the MetS group, and were more enhanced in the MetS + OVX and MetS + OVX + EGCG groups, as compared to the control group (Fig. 5). Here, UQCRC2 is linked to metabolic syndrome.