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:Nuclear localization of FANCA is critical for its function, and appears to be regulated by its tertiary conformation of the C-terminus;(18,27,39) and Hsp90 regulates transmembrane trafficking of some client proteins.(2) We therefore studied the effect of 17-AAG on subcellular localization of FANCA.
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