Binding of M- and U-CLL mAbs to synthetic peptides derived by selection with U-CLL mAbs. Binding of M- and U-CLL mAbs to 12mer peptides with sequences derived from phage selection analyses with U-CLL mAbs was tested by ELISA. (A-B) Reactivities with peptides 068-4 and 114-1, respectively. (C-D) Reactivities of mAbs with scrambled peptides used as negative controls.