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 example, NusA binds reversibly to RNAP in affecting pausing and termination (120) but is believed to bind irreversibly in an antitermination complex with N (8, 45) or Q of bacteriophage 82 (82Q) (126).
Category: