Cell viability assay
Raw264.7 cells (1 × 106 cells/mL) were cultured in 96-well plate for 20 h. Then, cells were cultured with LPS (1 μg/mL) and the ethanolic extract of M. myagroides (0.1, 1, 10, 50, and 100 μg/mL) for 22 h at 37 °C and 5% CO2. The 5 mg/mL MTT reagent was added and incubated for 2 h. The medium was then discarded and DMSO was added to each well and absorbance was measured at 540 nm with a microplate reader (Model 550, Bio-rad, Richmond, Virginia, USA). The cell proliferation ability was calculated according to the following formula: