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:Individual members of the formin family have been shown to mediate formation of functionally distinct actin structures in cells, including SFs, filopodia, isotropic cortical actin networks, and mitochondria-associated actin (Skau and Waterman 2015; Campellone and Welch 2010).
Category: