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:DGC via S-SCAM and SynArfGEF binding to dystrophin (Sumita et al. 2007; Fukaya et al. 2011), NL2 does not appear to play a role in synapse formation, in striking contrast with our results that a-dystroglycan is required for formation and maintenance of synapses from CCK-basket cells (Fr√ºh et al.
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