1. 1Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool L69 7ZB, U.K.
2. 2Department of Biochemistry & Molecular Biology, University of Georgia, Athens, GA 30602, U.S.A.
3. 3Centre for Proteome Research, Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool L69 7ZB, U.K.
4. 4Institute of Bioinformatics, University of Georgia, Athens, GA 30602, U.S.A.