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(A) The viability of MDA-MB-231 cells exposed to Plectranthus spp. extracts (15 μg/mL) for 48 h assessed by the crystal violet staining assay using doxorubicin (DOX, 5 μM) as positive control; (B) Concentration-response profile for the P. madagascariensis extract obtained by maceration in acetone. Results are expressed as mean ± standard deviation (SD) from at least two independent experiments. IC50: extract concentration producing 50% inhibition of cell viability.
