Figure S4. Increased CX3CR1 expression density in CD206 + CCR5+ non-classical monocytes in severe COPD patients. CD206 + CCR5+ co-expressing cells were stained for CX3CR1, and the mean fluorescence intensity (MFI) for each patient population was determined. Results represent the mean MFI ± SEM of all subjects in each subject group. * = p < 0.05. (PDF 4 kb