Fig. 1.

Chemical structures of quercetin and mono-methylated quercetin isorhamnetin, tamarixetin, 3-O-methylquercetin, azaleatin and rhamnetin (a). Effects of quercetin and methylquercetin on cell viability in AML12 cells (b). The cells were incubated in BSS with or without various concentrations of quercetin and methylquercetin (0, 3, 10, 30 µM) for 2 h. WST-8 reagent was added 1 h before measurement of OD 450 nm. Data are expressed as a percentage of the vehicle control (DMSO). Each value represents mean ± SEM for six wells