 This links BioPAX to information useful for modelling, especially by adding quantitative descriptions described by SBO.SBO is built in collaboration by the Computational Neurobiology Group (Nicolas Le Novère, EMBL-EBI, United-Kingdom) and the SBMLTeam (Michael Hucka, Caltech, USA).SBO has benefited from the funds of the European Molecular Biology Laboratory and the National Institute of General Medical Sciences.