The effect of smoking on immune-inflammatory gene expression levels in rheumatoid arthritis (RA) synovia. The figure shows mean gene expression levels ± standard error of the mean (SEM) in synovia obtained from patients with RA who smoked (solid bars) compared to non-smokers (open bars). All mRNA levels are expressed relative to glyceraldehede-3-phosphate dehydrogenase (GAPDH). *P < 0.05, Mann Whitney U-test.
Kazantseva et al. Arthritis Research & Therapy 2012 14:R208 doi:10.1186/ar4046