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:For phylogenetic analyses, the obtained sequences were assembled to a reference set containing sequence information of 180 species of cichlid fishes from Lake Tanganyika (Boileau et al., 2015; Meyer et al., 2015) using CODONCODE ALIGNER.
Category: