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 Molecular Vision
Site-specific mutagenesis: Recombinant human WT αB-
crystallin or its deamidated constructs, previously generated by Gupta and Srivastava [32], were used in this study.
Category: