CRYSTAL STRUCTURE OF HUMAN ADENYLOSUCCINATE LYASE IN COMPLEX WITH AMP 2J91 LYASE, DISEASE MUTATION, ADENYLOSUCCINASE, SUCCINO AMP-LYASE, PURINE BIOSYNTHESIS, ALTERNATIVE SPLICING, ADENYLOSUCCINATE LYASE, ADENYLOSUCCINASE DEFICIENCY, AMP, ADSL, SAICAR, PURINE, S-AMP, EPILEPSY