The most notable changes in the protein composition of maternal plasma in late IUGR compared with low birth weight fetuses were observed for Gelsolin (GSN), Serum paraoxonase/lactonase 3 (PON3), Keratin type I cytoskeletal 10 (KRT10), Apolipoprotein C-I (APOC1), Hemopexin (HPX), and Transthyretin (TTR) (Supplementary S2 Figure S4). Here, HPX is linked to fetal growth restriction.