Figure 2).

Beta-carotene (BC)-induced chemotaxis of endothelial progenitor cells (EPCs) (A) and human umbilical vein endothelial cells (HUVECs) (B). Cells treated with sphingosine-1-phosphate (S1P) were used as positive controls. The chemotaxis index (CHI) is the ratio of stimulated migration divided by that of basal unstimulated migration of HUVECs in a control medium sample. Values are expressed as means ± SEM (n=3, performed in triplicates). *Significantly different (P<0.05) from the corresponding control. AA Arachidonic acid; THF/EtOH Tetrahydrofuran/ethanol