[1] SCRIPPS CLIN & RES FDN,DEPT BASIC & CLIN RES,DIV BIOCHEM,LA JOLLA,CA 92037
[2] UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,MEMBRANE BIOENERGET GRP,BERKELEY,CA 94720
[3] UNIV CALIF BERKELEY,DEPT PHYSIOL ANAT,BERKELEY,CA 94720
[4] UNIV PENN,DEPT BIOCHEM & BIOPHYS,PHILADELPHIA,PA 19104