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Databases and Systems

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68<br />

organism1:gene1 organism2:gene2<br />

Table 3 shows the list of databases currently supported by DBGET/LinkDB in the<br />

Japanese GenomeNet service. LinkDB is the database of binary relations containing<br />

original links annotated by each database, reverse links <strong>and</strong> indirect links that are<br />

obtained by combining multiple links, <strong>and</strong> similarity links that are computationally<br />

derived by BLAST <strong>and</strong> FASTA searches. DBGET/LinkDB is a network distributed<br />

database system, so that the user can add local databases to be integrated with the<br />

GenomeNet databases.<br />

Table 3. The databases supported by DBGET/LinkDB in GenomeNet.<br />

DBGET/LinkDB allows generic naming of the database names, such as DNA for<br />

GenBank + EMBL <strong>and</strong> protein for SWISS-PROT + PIR + PRF + PDBSTR. This<br />

mechanism is used to define the GENES database that is the collection of all gene<br />

catalogs in KEGG. The PATHWAY database is the DBGET implementation of the<br />

collection of all biochemical pathways in KEGG, where each entry is a GIF image<br />

map for the pathway diagram. In addition to GENES <strong>and</strong> PATHWAY, the LIGAND<br />

database [5] is also a product of the KEGG project. LIGAND is a composite<br />

database currently consisting of two sections: ENZYME for enzymatic reactions <strong>and</strong><br />

COMPOUND for chemical compounds.<br />

KEGG system<br />

While the DBGET/LinkDB system is designed to manipulate databases at the entry<br />

level, the KEGG system is designed to h<strong>and</strong>le specific data items in each entry of the<br />

KEGG databases, such as genes, enzymes, <strong>and</strong> compounds. The KEGG system is<br />

under continuous development, but as of June 1998 it consists of the following<br />

programs:<br />

(1) CGI scripts to search <strong>and</strong> color GIF image maps

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