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:Antibodies for immunohistochemistry were: anti-FSP1 rabbit polyclonal antibody, 1:1,000 (7, 8); FITC- or P6-labeled goat anti-rabbit IgG (Vector Laboratories Inc.
Category: