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:The inverse correlation between FABP2 expression and serum FFA in our study may be explained by the involvement of FABP2 in intestinal FA utilization (3); overexpression of FABP2 may have stimulated mitochondrial b-oxidation and intestinal FA utilization, which may reduce FA availability in the circulation (27).
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