Swiss Institute for Bioinformatics, CMU, 1 Rue Michel Servet, 1211 Geneva 4, Switzerland. pascale.gaudet@isb-sib.ch|Swiss Institute for Bioinformatics, CMU, 1 Rue Michel Servet, 1211 Geneva 4, Switzerland. pascale.gaudet@isb-sib.ch|Swiss Institute for Bioinformatics, CMU, 1 Rue Michel Servet, 1211 Geneva 4, Switzerland. pascale.gaudet@isb-sib.ch|Swiss Institute for Bioinformatics, CMU, 1 Rue Michel Servet, 1211 Geneva 4, Switzerland. pascale.gaudet@isb-sib.ch