Schematic representation of the MLL, CBP, and MLL-CBP fusion proteins, and MLL and CBP cDNA probes and primers (MLL-7S, MLL-11A, CBP-2S, CBP-1A). C/H rich, cysteine/histidine rich; Q rich, glutamine rich. The position of the motifs in CBP were derived from the published protein sequence. The MLL-CBP fusion protein retains the key domains from both proteins.