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For certain tables (notably those associated with the UCSC Genes track and its main table, knownGene) several layers of linked tables (presented diagrammatically in A) may contain information of interest. They can be joined together with successive steps to provide a table of data from the linked tables (B). Here, the Gene Ontology (GO) data are pulled from a different table, “go”, that is available for linkage from several different assembly-specific databases.
