SOLUTION STRUCTURE OF THE THIRD SH3 DOMAIN OF SH3-DOMAIN KINASE BINDING PROTEIN 1 (REGULATOR OF UBIQUITOUS KINASE, RUK) APOPTOSIS, SH3 DOMAIN, STRUCTURAL GENOMICS, NPPSFA, NATIONAL PROJECT ON PROTEIN STRUCTURAL AND FUNCTIONAL ANALYSES, RIKEN STRUCTURAL GENOMICS/PROTEOMICS INITIATIVE, RSGI 2DA9