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:Furthermore, GFP-ATG16L1 precipitated mCherryTMEM74 and endogenous TMEM74 (Figure 2e), conversely, GFP-ATG16(1-320) failed to bindmCherry-TMEM74 (Figure 2f), suggesting that the WD repeats domain of ATG16L1 was required for the interaction with TMEM74.
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