Freije et al. (31) reported that the DEGs were Ccrn4lb, Per1, Per2, Per3, Nr1d1, Npas2, Arntl, Igfals, Nrep, Apol3, Got1, and so on in IUGR liver compared to AGA at 21 days of age. The gene discussed is PER2; the disease is fetal growth restriction.