The CD38⁺ population size differs in individual patients of the bimodal expression group.

Three representative patients with a bimodal surface expression of CD38 are depicted (A-C). The intensity of CD19 and CD38 are shown on the x-axis and y-axis, respectively. The histograms in panels D-F show the profile of CD38 expression. The intensity of CD38 and the number of events are shown on the x-axis and y-axis, respectively.