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:Sequences were then edited, aligned with Genedoc (Nicholas and Nicholas, 1997) and finally checked for chimera using Bellerophon (Huber et al., 2004) and the Ribosomal Database Project (RDP, Cole et al., 2005).
Category: