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:To fulfill these functions, Hsp90 interacts with its cofactors and cochaperones including Hsp70, immunophilins, and p23, to form the Hsp90based chaperone complex.(1,2) Natural compounds such as geldanamycin and radicicol bind the ATP-binding pocket of Hsp90, and disrupt its chaperone function.
Category: