CD34 and B-cell acute lymphoblastic leukemia: FLAER binding was also lower in B-cell acute lymphoblastic leukemia (B-ALL) precursors (MFI = 3894.43) than in CD34+ and CD34− B-lymphoid precursors from control bone marrow (MFI = 11,235.60 and 17,448.67, respectively; Mann–Whitney U p < 0.005) (Figure 1A, lymphoid component).