COXFA4 and fetal growth restriction: As shown in Figure 8, IUGR led to the reduced gene expression of NADH dehydrogenase (ubiquinone) 1 alpha subcomplex 4 (NDUFA4, P = 0.074), NADH dehydrogenase (ubiquinone) 1 beta subcomplex 1 (NDUFB1, P = 0.097), succinate dehydrogenase complex flavoprotein subunit A (P = 0.063), cytochrome c oxidase V (COXV, P = 0.058), ATP synthase alpha subunit (ATP5A1, P < 0.05), and ubiquinol-cytochrome c reductase binding protein (UQCRB, P < 0.05) in the LM of piglets compared with the NBW.