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:region on cellularizing furrows, which is the region of the furrow to which membrane addition is known to occur (Lecuit and Wieschaus, 2000; Sisson et al., 2000; Pelissier et al., 2003), and furrow formation fails when Rab8 function is disrupted.
Category: