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:Previously, it was reported that cofilin defects cause the failure of neural tube closure, and the loss of both cofilin and destrin results in the arrest of epithelial branching with F-actin accumulation in kidney organogenesis [43, 44].
Category: