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:…of E-cadherin and b -catenin expression in WKPT-0293 Cl.2 cells by immunofluorescence labelling and immunoblotting
Cell–cell contacts are formed at the adherens junctions (AJs) by intercellular Ca2+-dependent E-cadherin homodimer formation (Vleminckx and Kemler 1999; Miyoshi and Takai 2005).
Category: