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:…border cell specification and migration, and significantly reduces female fertility, loss of apt, Socs36E, or miR279 does not result in sterility, as not all egg chambers are equally affected (Starz-Gaiano et al., 2008; Yoon et al., 2011; Montell et al., 2012; Monahan and Starz-Gaiano, 2013).
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