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:DNA damage resulting from TNP induced oxidative stress leads to the activation of p53[2-5,29,44,53,54], which triggers cell cycle arrest to prevent proliferation of cells with damaged DNA and ensure genomic stability[55].
Category: