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:Based on recent knowledge, cells may not opt for the germline mutation in an attempt to counteract haploinsufficiency, which, as shown for BRCA1, results in genomic instability and premature senescence in human breast epithelial cells [29].
Category: