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:…local protein translation is required for growth cone responses to guidance cues remains unresolved as a result of conflicting findings from different neuronal populations (Piper et al., 2006; Yao et al., 2006; Lin and Holt, 2007; Bouchard et al., 2008; Lang et al., 2008; Roche et al., 2009).
Category: