IGF1 and fetal growth restriction: Immunofluorescence staining revealed IGF-1 (green) and nuclear (DAPI) fluorescence (Figure 6), with the mean fluorescence intensity of IGF-1 protein being significantly increased in the placentas of the IUGR group (n = 5) compared to the AGA group (n = 5) (***p < 0.001) (Figure 7).