[1] UNIV LONDON BIRKBECK COLL,DEPT CRYSTALLOG,IMPERIAL CANC RES FUND,STRUCT MOLEC BIOL UNIT,LONDON WC1E 7HX,ENGLAND
[2] INDIAN INST SCI,MOLEC BIOPHYS UNIT,BANGALORE 560012,KARNATAKA,INDIA
[3] UNIV YORK,DEPT CHEM,YORK YO1 5DD,N YORKSHIRE,ENGLAND
[4] CTR ADV RES BIOTECHNOL,ROCKVILLE,MD 20850
[5] BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973
[6] WEIZMANN INST SCI,DEPT BIOL STRUCT,IL-76100 REHOVOT,ISRAEL
[7] BROOKHAVEN NATL LAB,DEPT BIOL,PROT DATA BANK,UPTON,NY 11973