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:Moreover, recent findings in Drosophila suggest that the Y chromosome has an important role in male fitness and also contributes to adaptive phenotypic variation through a regulatory role of Y-linked polymorphic elements in gene expression (Lemos et al., 2008).
Category: