Swiss Institute of Bioinformatics (SIB), 1 rue Michel Servet, CH-1211 Geneva 4, Switzerland. christian.sigrist@isb-sib.ch|Swiss Institute of Bioinformatics (SIB), 1 rue Michel Servet, CH-1211 Geneva 4, Switzerland. christian.sigrist@isb-sib.ch|Swiss Institute of Bioinformatics (SIB), 1 rue Michel Servet, CH-1211 Geneva 4, Switzerland. christian.sigrist@isb-sib.ch|Swiss Institute of Bioinformatics (SIB), 1 rue Michel Servet, CH-1211 Geneva 4, Switzerland. christian.sigrist@isb-sib.ch|Swiss Institute of Bioinformatics (SIB), 1 rue Michel Servet, CH-1211 Geneva 4, Switzerland. christian.sigrist@isb-sib.ch|Swiss Institute of Bioinformatics (SIB), 1 rue Michel Servet, CH-1211 Geneva 4, Switzerland. christian.sigrist@isb-sib.ch