Fig. 2From: Phenolics from Barleria cristata var. Alba as carcinogenesis blockers against menadione cytotoxicity through induction and protection of quinone reductaseFold induction of NQO1 activity by isolated compounds 1,2,4 and 5.Hepa-1c1c7 were treated with either vehicle (DMSO) or indicated concentrations of the compounds for 48Â h and then cell lysates were assayed for NQO1 activity as described in the Materials and Methods sectionBack to article page