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Cell viabilities determined by MTT assay of ovarian A2780 wild-type carcinoma cells treated with (a) micelles with folate: free DOX (white), DOX/PHIM-f (gray), and DOX/m-PHSM(20%)-f (dark gray), (b) micelles without folate: free DOX (white), DOX/PHIM (gray), and DOX/m-PHSM(20%) (dark gray). DOX dose was equivalent to 1000 ng/mL in each formulation.
