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Cell viability of (a) human MG-63 osteoblast and (b) mouse L929 fibroblast cell lines 24 h after incubation with RFB-loaded liposomes (RFB LIP1, RFB LIP2 and RFB LIP3), at a lipid concentration of 0.5, 1.0, 2.0 and 5.0 µmol/mL. Cell viability was determined by MTT reduction assay. Results are expressed as mean ± SD of at least two independent experiments.
