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Flow cytometry analysis of apoptosis rate in HeLa (A) and MCF-7 (B) cells after 24 h of treatment with free RA and RA-SFNs. Cells not treated were used as negative control, cells treated with camptotecin were used as apoptosis positive control (annexin V) and cells not treated, fixed and stained were used as necrosis positive control (propidium iodide).
