TRANSCRIPTION, PB1, POLYBROMO 1 ISOFORM 1, BAF180, POLYBROMO-1D, PBRM1, BRG1-ASSOCIATED FACTOR 180, STRUCTURAL GENOMICS, STRUCTURAL GENOMICS CONSORTIUM, SGC 3G0J CRYSTAL STRUCTURE OF THE FIFTH BROMODOMAIN OF HUMAN POLY- BROMODOMAIN CONTAINING PROTEIN 1 (PB1)