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| Kyoto Encyclopedia of Genes and Genomes (KEGG) - http://www.genome.jp/kegg/kegg1a.html An integrated database resource consisting of 16 main databases, broadly categorized into systems information, genomic information, and chemical information as shown below. |
| Wolfram MathWorld - http://mathworld.wolfram.com/ Comprehensive encyclopedia of mathematics with 13,000 detailed entries. |