Dual acridine orange/ethidium bromide (AO/EB) fluorescent staining after incubation of Y8 secreted metabolite (25 μg/mL) on KB cancer cell line. Panels represent; A) treated KB cancer cell line after 24-h incubation, B) treated KB cancer cell line after 48-h incubation, C) treated KB cancer cell line after 72-h incubation, D) Untreated KB cancer cell line as control, a = apoptotic cells, b = normal intact cells.