[1] NHLBI, LAB MOL IMMUNOL, BETHESDA, MD 20892 USA
[2] LOUISIANA STATE UNIV, MED CTR, DEPT PHYSIOL, SHREVEPORT, LA 71130 USA
[3] INSERM, U347, GRP RADIOCHIM ADN, F-94276 LE KREMLIN BECITRE, FRANCE
[4] INST GUSTAVE ROUSSY, CNRS, URA 147, GRP REPARAT LESIONS RADIO & CHIMIOINDUITES, F-94805 VILLEJUIF, FRANCE
[5] NCI, RADIAT BIOL BRANCH, BETHESDA, MD 20892 USA
[6] UNIV CALIF SANTA BARBARA, DEPT CHEM, SANTA BARBARA, CA 93106 USA