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:Further comparison with the distribution of 11 -hydroxysteroid dehydrogenase type 2, which is found in the DCT and CNT (4) confirmed the different pattern of expression of RhCG in these segments (Fig.
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