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:With the capability of snatching electrons away from biomolecules[57], ROS are capable of inflicting damages such as cell and mitochondria membrane lipid peroxidation[4,5,29,45,58-67] and increased permeability of the outer mitochondrial membrane[4,27,68-72].
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