Figure 1. Differential gene expression and functional analysis of immune-related cell subtypes in COPD samples. (A–E) Volcano plots of the differential genes of the five immune cells, B_cell, Macrophage, Monocyte, NK_cell, and T_cells, respectively, in COPD samples, according to the order. (F) Functional enrichment analysis of the differential genes. (G) Differential gene protein-protein interactions network.