Figure 5. Validation of 24 aging- and COPD-related genes in GSE57148. (A) The comparative analysis of 24 aging- and COPD-related genes in GSE38974 and GSE57148 datasets; “&” means the genes with consistent relative expression trend in both GSE38974 and GSE57148 datasets. (B) Boxplot of the expression of 7 aging- and COPD-related genes (ATM, CDKN1A, CREB3L4, HIF1A, MXD1, PTPN1, and SOD2) in GSE57148. Data presented as probe intensity. *P <0.05; **P <0.01.