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:…cells incubated with 50 lM Cd2+ for 3 h in SFM, E-cadherin expression at the cell borders was diminished, probably as a consequence of disruption of the homodimeric E-cadherin interaction and subsequent degradation (Vleminckx and Kemler 1999; Rothen-Rutishauser et al. 2002; Miyoshi and Takai 2005).
Category: