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:Our results showed that disruption of the reductase genes resulted in significant decreases in the synthesis of fatty alcohol and WE by Mtb exposed to nitric oxide, nutrient starvation or combined MS that are thought to mimic in vivo conditions that lead to dormancy [11,26,33].
Category: