CLL mAbs bind phage-displayed peptides in a dose-dependent manner. Individual phages isolated after 3 rounds of selection with each CLL mAb were amplified and their antibody binding properties were studied by ELISA. A random phage clone derived from the initial phage library before selection was used as a negative control. (A-D) M-CLL mAbs 169, 183, 255, and 412. (E-H) U-CLL mAbs 014, 068, 114, and 270.