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:The signal-transduction pathway targeting c-Myb Cys43 is likely to involve either an oxidative modification, such as an aldehyde adduct (6, 10, 24, 42), or a nitrosylation of Cys43 (12, 48), because the Cys43 mutation would be refractory to either pathway.
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