In addition, sodium glucose linked transporter1 (SGLT1) was expressed relatively lower in the gut tissue of IUGR piglets compared to that of normal-sized piglets (Tang and Xiong, 2022), and GLUT4, the rate-limiting step of insulin-induced glucose uptake into the muscle (Krook et al., 2000), has been found to be decreased in IUGR piglets (Shen et al., 2018). The gene discussed is SLC2A4; the disease is fetal growth restriction.