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:Our extensive sampling of the first exon of bindin over the entire species range has confirmed the finding of McCartney and Lessios (2004) from Panamanian populations that selection is acting on this molecule in E. lucunter.
Category: