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:…24 April 1, 2013 Rap1 and Canoe regulate polarity | 947
roles in regulating cell–cell and cell matrix adhesion (Kooistra et al., 2007; Kim et al., 2011) and AJ:actin linkage during apical constriction (Sawyer et al., 2009) and its presence at the plasma membrane cytoskeleton is…
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