CRYSTAL STRUCTURE OF ENDONUCLEASE IV FROM THERMUS THERMOPHILUS HB8 3AAM HYDROLASE, DNA REPAIR, BASE EXCISION REPAIR, BER, TIM BARREL, ENDONUCLEASE, STRUCTURAL GENOMICS, NPPSFA, NATIONAL PROJECT ON PROTEIN STRUCTURAL AND FUNCTIONAL ANALYSES, RIKEN STRUCTURAL GENOMICS/PROTEOMICS INITIATIVE, RSGI