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:…gene has the potential to challenge oxazolidinone clinical utility as well as other antimicrobial classes (phLOPSA pattern) used in humans or animals (Arias et al., 2008; Kehrenberg and Schwartz, 2006; Kehrenberg et al., 2005, 2007; Long et al., 2006; Mendes et al,, 2008; Schwarz et al., 2000).
Category: