MSR1 and chronic obstructive pulmonary disease: The mean total percentages of MSR1+ positive cells were higher in the COPD group than the others (COPD group: 48.97 ± 12.31% vs. C group: 34.36 ± 9.30%, p = 0.0051, vs. NA group: 38.05 ± 9.22%, p = 0.0288, and vs. AA group: 33.81 ± 9.42%, p = 0.0025) (Figure 3A).