Immunogen sequence: ELECEEDVIP DSPITAFSFS GVNRLRRKEN PHVRYIEQTH TKLEHSVCAN EMRKVSKSST HPQHNPNENE ILVADTYDQS QSPMAKAHGT SSYTPDKS. CtIP, a 125 kD protein, was originally found interacting with a transcription repressor, CtBP, through the PLDLS motif (CtBP-