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:ACTIVATION OF TRANSCRIPTION FACTORS Roles for several transcription factors have been demonstrated in TLR activation, including AP-1-binding proteins (such as cjun and c-fos) and NF-κB (Akira, 2009; Kawai and Akira, 2010) and some of these have been implicated in TLR signaling in the mast cell.
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