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Additional dbxrefs for an association. Rows in the feature_cvterm table may be backed up by dbxrefs. For example, a feature_cvterm association that was inferred via a protein-protein interaction may be backed by by refering to the dbxref for the alternate protein. Corresponds to the WITH column in a GO gene association file (but can also be used for other analagous associations). See http://www.geneontology.org/doc/GO.annotation.shtml#file for more details
