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:Static complexes modified by 82Q in the presence of NusA but not in its absence resist both an oligonucleotide-mediated release reaction that models the intrinsic terminator (126, 156) and the activity of Rho (126); the latter suggests either that Rho has an obligatory target site in the region where RNA emerges, or that the Q-modified complex is strengthened enough to resist the force of the Rho translocase.
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