[1] Albert Einstein Coll Med, Dept Biochem, Bronx, NY 10461 USA
[2] EBI, Sequence Database Grp, EMBL Outstn, Cambridge CB10 1SD, England
[3] CNRS, Inst Fed Biol Struct & Microbiol Bioenerget & Ing, F-13402 Marseille 20N, France
[4] Univ Stellenbosch, Dept Biochem, ZA-7602 Matieland, South Africa
[5] Beilstein Inst Forderung Chem Wissensch, D-60487 Frankfurt, Germany
[6] Univ Cologne, CUBIC, Inst Biochem, D-50674 Cologne, Germany
[7] Trinity Coll Dublin, Dept Biochem, Dublin 2, Ireland