[1] STANFORD UNIV,STANFORD MAGNET RESONANCE LAB,STANFORD,CA 94305
[2] HARVARD UNIV,DEPT CHEM,CAMBRIDGE,MA 02138
[3] UNIV CALIF DAVIS,SCH MED,DEPT BIOL SCI,DAVIS,CA 95616
[4] MIT,DEPT CHEM,CAMBRIDGE,MA 02139
[5] YALE UNIV,NEW HAVEN,CT 06511
[6] SWISS FED INST TECHNOL,INST MOLEK BIOL & BIOPHYS,CH-8093 ZURICH,SWITZERLAND
[7] UNIV CAMBRIDGE,SCH MED,OTOLARYNGOL,MOLEC BIOL LAB,CAMBRIDGE CB2 2QH,ENGLAND
[8] UNIV OXFORD,DEPT INORGAN CHEM,OXFORD OX1 3PR,ENGLAND
[9] UNIV ILLINOIS,DEPT PHYS,LOOMIS LAB PHYS,URBANA,IL 61801
[10] STATE UNIV GRONINGEN,PHYS CHEM LAB,9747 AG GRONINGEN,NETHERLANDS
[11] MAX PLANCK INST MED RES,DEPT BIOPHYS,D-6900 HEIDELBERG,FED REP GER
[12] NATL INST MED RES,LONDON NW7 1AA,ENGLAND