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 increased ODC1 expression after fadrozole treatment may indicate an enhancement of the ODC/polyamine system and/or suggests a new pathway for E2 to regulate GABA production in addition to the known effects of E2 on glutamic acid decarboxylase in goldfish (46).
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