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Shh transcript levels are decreased in COPD lung tissues. Dot plot with median showing normalized expression of Log2-transformed SHH expression in lung tissue from non-COPD (n = 91) and COPD patients (n = 145). ***, p < 0.0001. Transcript expression microarrays were extracted from the GSE47460 dataset available at (https://www.ncbi.nlm.nih.gov/gds). Non-COPD patients are represented by black circles and COPD patients are represented by red circles
