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 our previous study, we found that RAG-mediated nicking and cleavage of oligonucleotide substrates containing cRSSs identified from lymphoid malignancies were either unchanged or slightly reduced in the presence of HMGB1 for most cRSSs tested (including LMO2, TAL1, Hox11, SIL, SCL), except Ttg-1 [24].
Category: