RBBP5, RBQ3, Retinoblastoma-binding protein 5, RBBP-5, Retinoblastoma-binding protein RBQ-3
As part of the MLL1/MLL complex it is involved in methylation and dimethylation at Lys-4 of histone H3. H3 Lys-4 methylation represents a specific tag for epigenetic transcriptional activation.