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:Such a conclusionmight also explain the apparent absence of structural protein fragments from 2DE maps in the tender group, as it has been reported that lower pH (other than actual proteolysis) contributes to fiber dissociation and triggers exposition of muscle fibers to proteolytic attacks [10].
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