“…Cells were cultured in 96-well plates and treated with DMSO or graded concentrations of Rh2 (0.01, 0.1, 1.0, 10, 50, or 100 µmol/L) for 24, 48, and 72 h, according to our previous report (Zhu et al, 2010(Zhu et al, , 2012. Using a spectrophotometric plate reader (Bio-Tek ELX-800, Winooski, VT, USA), the absorbance (OD) at 450 nm was recorded to determine cell viability.…”