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 observations are in accord with the result of Lumb and coworkers that the C-terminus activation domain of human c-Fos, although functionally active, is essentially devoid of the stable a-helical or b-sheet structure typical of globular proteins (Campbell et al. 2000).
Category: