CD19 and B-cell chronic lymphocytic leukemia: This pan-CLL network was structurally similar to a network for CD19+ B cells that we inferred from publicly available DNase-seq data using the same bioinformatic method (Supplementary Fig. 18), and in the absence of a large chromatin accessibility data set of B cells from healthy individuals it is not possible to conclusively identify the CLL-specific parts of our network.