CLDN1 and fetal growth restriction: The results showed that, compared with the NBW piglets, the IUGR piglets had a lower (P < 0.05) gene expression of ZO-1 (Figure 6(a)) and Occludin (Figure 6(c)) in jejunum mucosa, as well as a tendency (P = 0.056) to decrease the gene expression of Claudin-1 (Figure 6(b)).