Binding of M-CLL and U-CLL mAbs to synthetic peptides derived by selection with M-CLL mAbs. Binding of M-CLL and U-CLL mAbs to 12mer peptides with sequences derived from phage selection analyses was tested by ELISA. Peptides with a scrambled amino acid order were used as negative controls. (A-D) CLL mAb reactivities with peptides 169-2, 169-8, 183-adapted, and 412-9, respectively. (E-H) Reactivities of mAbs to scrambled peptides.