Effect of polyethylene particles on serum levels of IL-6 in each mice group. Blood was obtained by cardiac puncture 14 days after surgery (n = 5 per group). Serum levels of IL-6 were determined by ELISA. Results are presented as mean ± standard error of the mean (a indicates P < 0.01; b indicates P = 0.01; c indicates P < 0.005, compared to internal control).
Nich et al. Arthritis Research & Therapy 2011 13:R100 doi:10.1186/ar3381