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:We have focused herein on the importance of TJs in maintaining the proper compartmentalization of bile constituents, a concept that is supported by results from recent studies using experimental models of colitis or bile duct ligation (16, 18, 21, 31, 34).
Category: