1e-91e-81e-71e-61e-51e-400.20.40.60.8150% viabilityconcentration (M)viability (fraction of untreated)Dose-response: a dilution series is only evenly spaced in logcompound A, EC50 = 30 nMcompound B, EC50 = 600 nMcompound C, EC50 > top dose