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:Down’s syndrome cell adhesion molecule (Dscam) has been shown to regulate dendrite self-avoidance inDrosophila (Hughes et al., 2007;Matthews et al., 2007; Soba et al., 2007) and mouse (Fuerst et al., 2008, 2009).
Category: