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:Further evidence is provided by Mammucari et al who have discovered that integration of the Notch and NFAT/calcineurin signaling pathways seems to be important for keratinocyte differentiation [6] and Zanotti et al who have identified Notch and NFAT signaling as reciprocally inhibiting pathways that together regulate osteoblast function [7].
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