Swiss Institute of Bioinformatics, Centre Medical Universitaire, 1 Rue Michel Servet, 1211 Geneva 4, Switzerland. swiss-prot@expasy.org|Swiss Institute of Bioinformatics, Centre Medical Universitaire, 1 Rue Michel Servet, 1211 Geneva 4, Switzerland. swiss-prot@expasy.org|Swiss Institute of Bioinformatics, Centre Medical Universitaire, 1 Rue Michel Servet, 1211 Geneva 4, Switzerland. swiss-prot@expasy.org|Swiss Institute of Bioinformatics, Centre Medical Universitaire, 1 Rue Michel Servet, 1211 Geneva 4, Switzerland. swiss-prot@expasy.org