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:…inclusions (Saudou et al., 1998; Bodner et al., 2006), and from the observation that expression of mutant tau in human tauopathies (Reed et al., 2001) and in Drosophila (Wittmann et al., 2001) can lead to neuronal loss without passing through a tangle stage raise the possibility…
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