Figure 4. Effects of semaphorin 3A on the cell cycle of human umbilical vein endothelial cells. Shown are the cell cycle data of the different human umbilical vein endothelial cell (HUVEC) groups (G2/M phase + S phase). The data are presented as the mean±standard error of the mean (SEM). Each experiment was repeated at least three separate times. *p<0.05; **p<0.01.