[1] MIT,CTR CANC RES,CAMBRIDGE,MA
[2] MRC UNITED KINGDOM,CAMBRIDGE,MA
[3] HARVARD UNIV,MED SCH,BOSTON,MA
[4] MASSACHUSETTS GEN HOSP,INFECT DIS UNIT,BOSTON,MA
[5] NCI,NUCL ACID ENZYMOL SECT,LAB BIOCHEM,BETHESDA,MD
[6] STANFORD UNIV,MED CTR,DEPT BIOCHEM,STANFORD,CA
[7] NATL ACAD SCI,ASSEMBLY LIFE SCI,DIV MED SCI,2101 CONSTITUTION AVE NW,WASHINGTON,DC 20418