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Cell cycle analysis by flow cytometry. (A) Flow cytometric analysis of cell cycle proportions. (B) UVB exposure raises G2 phase arrest in HaCaT keratinocytes. p21 overexpression (p21+) potentiated G2 phase arrest both before and after UVB irritation, while p21 silencing (p21–) diminished G2 phase arrest both before and after UVB irritation. * p<0.05 vs. CON, # p<0.05 vs. p21+, @ p<0.05 vs. p21–, & p<0.05 vs. UVB-CON.
