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:…of three transcription factors that regulate expression of genes involved in lipid homeostasis and glucose metabolism (Jeon and Osborne, 2012; Raghow et al., 2008), and Srebp1/2 are known to interact with Hmgb1/2; their activity has been reported to be enhanced by Hmgb1 (Najima et al., 2005).
Category: