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:…investigations and recent mRNA profiling studies have demonstrated that these adaptive responses occur at the transcriptional level in Arabidopsis (Branco-Price et al. 2005; Liu et al. 2005; Klok et al. 2002) and crop species, such as rice (Lasanthi-Kudahettige et al. 2007), sesame (Wang et al.…
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