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:Immunoblotting using primary antibodies for anti-eNOS (BD Biosciences), anti-phospho-eNOS Thr495 (Cell Signaling), anti-phosphoeNOS Ser1177 (Millipore), anti-eNOS (BD Transduction Laboratories), anti-RhoA (Abcam), and anti-b-actin (Sigma) was performed as described previously, following a 1 h incubation with IL-17 (mouse rIL-17A, 1 mg/mL; eBioscience).(28,29) Immunoblotting was also performed for these proteins in IL17-treated cells following co-treatment with an IL-17 neutralizing antibody (20 ng/mL for 30 min; BioLegend), the protein kinase C (PKC) inhibitor Gö6976 (1 mmol/L for 30 min; Sigma), the Rho-kinase inhibitor Y-27632 (50 mmol/L for 30 min; Cayman Chemical Co.
Category: