KEGG: Kyoto Encyclopedia of Genes and GenomesSearch by: Pathway maps & modules, Functional hierarchies & ontologies, Brite hierarchies, Human Disease classification, Drugs ATC & classification, KO system & ortholog annotation, Genes & proteins, Genomes, organisms, Chemical compounds, Compound classification, Glycans, Reactions, KEGG PATHWAY & BRITE mapping tools, Navigation tool to explore KEGG global maps, automatic annotation server, Sequence similarity, Chemical structure similarity, and Biodegradation/biosynthesis pathway prediction.