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:…cargo trafficking (Cai et al., 2011; Gallon et al., 2014; Lauffer et al., 2010; Lunn et al., 2007; Steinberg et al., 2013; Temkin et al., 2011; Valdes et al., 2011; Wang et al., 2013), and our results now suggest an additional unique property of this protein with respect to lipid headgroup…
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