Cytotoxicity was determined by using Vybrant® MTT assay kit (Thermo Scientific). Similar to the previous report [20 (link)], RAW 264.7 cells (1 × 106 cells) were treated for 16 h with SKBHT dissolved in PBS, and then metabolically active cells were measured by a plate reader (BioTeK, VT, USA) as instructed by the manufacturer's protocol (Thermo Scientific). Live cells were calculated in a percentage against untreated cells. Each assay was conducted in triplicate samples, and measurement was repeated three times.
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