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MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay of HeLa cells without any treatment (control) and subsequent to application of staurosporine (2 µM, 2.5 h) or PMA (250 nM, 48 h). Medians ± median absolute deviations (MADs) of optical density readouts were determined after three independent measurements at 550 nm (background wavelength: 630 nm).
