3G5O THE CRYSTAL STRUCTURE OF THE TOXIN-ANTITOXIN COMPLEX RELBE2 (RV2865-2866) FROM MYCOBACTERIUM TUBERCULOSIS TOXIN/ANTITOXIN, HETEROTETRAMER, 1:1 RATIO, STRUCTURAL GENOMICS, PSI-2, PROTEIN STRUCTURE INITIATIVE, TB STRUCTURAL GENOMICS CONSORTIUM, TBSGC, INTEGRATED CENTER FOR STRUCTURE AND FUNCTION INNOVATION, ISFI, TOXIN/ANTITOXIN COMPLEX