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:neoformans cells differentiate into enlarged titan cells with a thick cell wall and a highly crosslinked capsule (Feldmesser et al., 2001; Okagaki et al., 2010; Zaragoza et al., 2010).
Category: