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:What NusA contributes was revealed by nuclease probing of RNA emerging from the 82Q-modified complex: If NusA is present, the usual RNA emergence at about 14 nucleotides from the growing end is extended to about 25 nucleotides, implying that NusA and 82Q construct a barrier where the hairpin of an intrinsic terminator forms (126).
Category: