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 colocalization of VGLUT2 with Cu terminals in the CN shown in this study confirms that the Cu pathway to the CN is glutamatergic and demonstrates that Cu projections, like those from Sp5 and the contralateral CN (Zhou et al., 2010) use VGLUT2 to mediate glutamate transport at both MF and SB terminal endings.
Category: