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. This evidence concerns the gene PER1 and fetal growth restriction.