In human lung, there was no statistically significant change in GSN expression in ciliated cells from COPD lungs (FC 0.135, P = 0.075), while there was a significant decrease in GSN expression level in AT1 cells (Figure 6B, log2FC –0.713, P = 1.07×10–7). The gene discussed is GSN; the disease is chronic obstructive pulmonary disease.