CRYSTAL STRUCTURE OF THE N-TERMINAL DOMAIN OF AN HSP90 FROM TRYPANOSOMA BRUCEI, TB10.26.1080 IN THE PRESENCE OF AN THE INHIBITOR BIIB021 CHAPERONE, TRYPANOSOMA, AFRICAN SLEEPING SICKNESS, HEAT SHOCK PROTEIN, STRUCTURAL GENOMICS, STRUCTURAL GENOMICS CONSORTIUM, SGC 3O6O