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:Interestingly, the HDAC4-
Dach2-myogenin transcriptional axis is also required for full
induction of the ubiquitin E3 ligases MuRF1 and atrogin-1 that
promote atrophy (Cohen et al., 2007; Macpherson et al., 2011;
Moresi et al., 2010).
Category: