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:The separation of border cells is the endpoint of a coordinated set of processes within the root cap (Baluska et al. 1996a; Barlow 1975; Feldman 1984; Rost 2011; Wen et al. 1999).
Category: