dictyBase, the model organism database for Dictyostelium, provides well integrated, high quality data and tools for Dictyostelium discoideum and related species. dictyBase houses the complete genome sequence, ESTs, and the entire body of literature relevant to Dictyostelium. This information is curated to provide accurate gene models and functional annotations, with the goal of fully annotating the genome to provide a 'reference genome' in the Amoebozoa clade. New features include ortholog display and the complete integration of the Dicty Stock Center with dictyBase.