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:Interestingly, there is evidence that NAD(P)H oxidase and/or ROS may also act upstream of tuberin/ mTORC1 (34,40,41), suggesting that ROS generated bymTORinduced Nox4 may target tuberin via a feedback loop.
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