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:In addition, there is significant evidence for hydrophobic clustering in the unfolded states of some folded proteins, including the drkN SH3 domain (35–37), reduced unfolded lysozyme (38), and acid-denatured apomyoglobin (24).
Category: