Box and whiskers diagram of survival of 2 × 10⁶/mL B-CLL cells from two patients (UPN 5 and 6 in Table 2) cultured in eight parallel cultures per condition for 24 hours in medium with 10% FCS under the listed conditions. Viability was assessed by PI-exclusion with acquisition of 5 × 10⁴ ungated events on a flow cytometer. From these data the mean percent viability (crosses), the 95% confidence interval for estimation of the mean (boxes), and one standard deviation above and below the mean (bars) were calculated.