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(A) The surfactant protein D (SP-D) serum levels of COPD patients and healthy control (*P<0.05, compared with the healthy group). (B) The HLA-A gene frequency in the blood samples of eight healthy controls (1/8, 12.5%) and eight COPD patients (5/8, 62.5%).
Abbreviations: COPD, chronic obstructive pulmonary disease; GAPDH, glyceraldehyde 3-phosphate dehydrogenase.
