[Encoded by human MLLT3 Gene, 568-aa 63-kDa AF-9 Protein is a putative transcription factor similar to TFG3/ANC1 (Yeast) and contains similar functional domains as MLLT1 and MLLT2 (Human), including nuclear targeting sequences, serine-rich and proline-rich regions, and stretches abundant in basic amino acids. A common acute leukemia chromosomal translocation t(9;11)(p22;q23) involves a fusion of MLLT3 and MLL/HRX that produces a chimeric rogue activator protein. ( NCI )] (UMLS (NCI) C0216705) =Amino Acid, Peptide, or Protein; Biologically Active Substance ;