Skip to main content
. 2014 Jan 30;9(1):e87400. doi: 10.1371/journal.pone.0087400

Figure 2. The number of CD68 positive cells in non-smoker, smoker and chronic obstructive pulmonary disease patient (COPD).

Figure 2

*: p<0.01. The Global Initiative for Chronic Obstructive Lung Disease (GOLD) clinical criteria for the diagnosis and severity of COPD stage I: mild, II: moderate, III: severe, IV: very severe.