[1] ENEA,BIOPHYS LAB,ROME,ITALY
[2] LUDWIG INST CANC RES,JOINT PROT STRUCT LAB,CH-1066 EPALINGES,SWITZERLAND
[3] ROYAL MELBOURNE HOSP,WALTER & ELIZA HALL INST MED RES,PARKVILLE,VIC 3050,AUSTRALIA
[4] HOSP SICK CHILDREN,RES INST,TORONTO M5G 1X8,ONTARIO,CANADA
[5] UNIV WASHINGTON,INST BIOMEMBRANE,SEATTLE,WA 98195