Genes such as Fam134b, Upp2, Aspa, Gadd45b, and Prkaa2 were significantly upregulated and Paqr9, Fam82a1, Ifi47, Paqr7, G0s2, and Cyp4a1 were markedly suppressed in IUGR, relative to AGA. Here, RETREG1 is linked to fetal growth restriction.