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:5-HT-evoked currents recorded from outside-out patches excised fromHEK-293 cells expressing WT 5-HT3A receptors resemble miniature whole cell currents with no discernible unitary events (3, 5, 7).
Category: