Fig. 2.

Antimutagenic activity (%) of Rhododendron arboreum extracts in TA-98 and TA-100 strains of Salmonella typhimurium. Pre-incubation (PI) and co-incubation (Co-I) modes of experimentation; without metabolic activation against direct acting mutagens, 4-nitro-O-phenylenediamine for TA-98 & sodium azide for TA-100 and with metabolic activation against 2-aminofluorene using rat liver homogenate (S9). (A) methanol extract of leaves (MEL) without metabolic activation; (B) methanol extract of leaves (MEL) with metabolic activation; (C) methanol extract of flowers (MEF) without metabolic activation; (D) methanol extract of flowers (MEF) with metabolic activation.