Reactome knowledgebase of human biological pathways and processes. - Lisa Matthews; Gopal Gopinath; Marc Gillespie; Michael Caudy; David Croft 001; Bernard de Bono; Phani V. Garapati; Jill Hemish; Henning Hermjakob; Bijay Jassal; Alexander Kanapin; Suzanna Lewis; et al. (Nucleic Acids Res., 2009)