Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:fumaroxidans was built from KEGG [43] (S6 Dataset and S7 Dataset) using the RAVEN Toolbox [42], which uses protein homology to identify the KEGG Orthology (KO) ID for each gene in a genome.
Category: