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:2008) and is involved in the inactivation of extrinsic as well as intrinsic apoptosis pathways, by interacting with pro-apoptotic proteins like p53, Bcl-2, Bax, Bad, PUMA, MSH2, MSH6 and others (Ludwig-Galezowska et al. 2011).
Category: