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 D motif has greater affinity to bind SHP-2, cause cytoskeletal alterations (Higashi et al., 2002a;
Azuma et al., 2004), and may induce greater levels of IL-8 than the corresponding C motif (Fig.
Category: