Fig. 3From: Systematic analysis of various RNA transcripts and construction of biological regulatory networks at the post-transcriptional level for chronic obstructive pulmonary diseaseValidation of hub genes at the protein level. Western blot analysis shows DDB2 and RUVBL1 protein expression in lung tissues from non-smokers, smokers without COPD, and smokers with COPD (upper left panel and lower left panel), as well as COPD rats and controls (upper right panel and lower right panel). *P < 0.05, **P < 0.01Back to article page