Drug synergy plots for ara-C and HU or dF-dC in primary patient-derived AML blasts. Each data point indicates an average delta score from a single patient sample subjected to a dose-response matrix experiment performed in triplicate, n = 16 for HU and n = 9 for dF-dC. Zero, >0, or <0 corresponds to additive, synergy, or antagonism, respectively, whilst >5 indicates strong synergy. Median, upper and lower quartiles, and range of delta scores are indicated by box-and-whisker plots. 