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 C2 motif is suggested to be involved in the transcriptional repression by AtMYB4 and FaMYB1, containing the core sequence LXLXL, which is also part of the EAR repressor motif (Jin et al. 2000; Aharoni et al. 2001).
Category: