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Figure 4:  Colony formation assay of HaCaT cells in different groups. (a) Several randomly chosen fields were photographed in different groups. (b) Vascular endothelial growth factor promoted cell colony formation significantly. Semaphorin 3A and acitretin restrained the colony formation of HaCaT cells. *P < 0.05, **P < 0.005 versus control group. #P < 0.05, ##P < 0.005 versus vascular endothelial growth factor exposed groups

Figure 4:  Colony formation assay of HaCaT cells in different groups. (a) Several randomly chosen fields were photographed in different groups. (b) Vascular endothelial growth factor promoted cell colony formation significantly. Semaphorin 3A and acitretin restrained the colony formation of HaCaT cells. *<i>P</i> < 0.05, **<i>P</i> < 0.005 versus control group. <sup>#</sup><i>P</i> < 0.05, <sup>##</sup><i>P</i> < 0.005 versus vascular endothelial growth factor exposed groups