Binding of M-CLL mAb 412 to peptide 412-9 and its fragments. Fragments of peptide 412-9 were synthesized (peptides 412-9-1, -2, -3, -4; bottom) and tested for binding to CLL 412 mAb in ELISA. Peptide 412-9scr with a scrambled amino acid order was used as a negative control.