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:Additionally, as previously shown [22], disruption of the HIR complex in a strain carrying a deletion of HPC2 (hpc2D) also prevented recruitment of SWI/SNF to HTA1-HTB1 (Figure 4A, compare hpc2D and WT).
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