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:…with the program PAUP 4.0b10 (Swofford 2002), using 2607 bp of the mitochondrial sequence alignment (nd1, nd2, coI, cytb, 12S, 16S, and the Leu, Ile, Gln, Trp, Met, Ala, Asn, Cys and Tyr tRNA genes) of Weisrock et al. (2006) deposited in TreeBase (http://www. treebase.org; TreeBase S1513).
Category: