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:Identifying Cul2 as part of the STAT regulatory circuit provides mechanistic insight about how an optimal number of border cells are specified (Starz-Gaiano et al., 2008; Yoon et al., 2011;Monahan and Starz-Gaiano, 2013).
Category: