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:By contrast, 3H-forskolin, which labels the G,-adenylate cyclase complex (Seamon et al., 1984), shows pronounced density in the molecular layer of the cerebellum without labeling the deep nuclei (Worley et al., 1986b).
Category: