Effect of 3-hydroxyflavone and its structural analogues on viability of cultured HepG2 cells. Cultured HepG2 cells were treated with DMSO (0.1% v/v; vehicle), dextran (1% w/v), Triton X-100 (0.1% v/v), or various concentrations (10, 30, or 100 μM) of 3-hydroxyflavone, galangin, datiscetin, kaempferol, morin, quercetin, isorhamnetin, tamarixetin, myricetin, or syringetin. Cell viability was quantified as described under Methods. Data are expressed as mean ± S.E.M. for four experiments. *, significantly different from the vehicle-treated control group (P < 0.05).