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:…10% of randomly chosen mRNAs were localized to the oocyte (Dubowy and Macdonald, 1998), and the oocyte enrichment of specific mRNAs has been documented including osk, bcd, grk, oo18 RNA-binding protein
(orb), egl, and BicD (Costa et al., 2005; Mach and Lehmann, 1997; Suter and Steward, 1991).
Category: