ROR1 and precursor B-cell acute lymphoblastic leukemia: A firm 120-kDa band, which we previously correlated with cell surface ROR1 in primary CLL cells [13], B-ALL cell lines (Fig. 2C), and primary B-ALL blasts (data not shown), was only detected in the positive control (Burkitt lymphoma cell line CA-46), but not in normal pediatric tissues (Fig. 5B).