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:These results are in agreement with the observations in many cell types that agonist-induced AA release is mainly mediated by cPLA2 (Ui et al., 1995; Wu-Wong et al., 1996; Kramer and Sharp, 1997; Trevisi et al., 2002).
Category: