As shown in Figure 3(b), KEGG analysis of 212 DEGs from GSE36854 and GSE21001 showed involvement in coronavirus disease, cytokine-cytokine receptor interaction, inflammatory bowel disease, Chagas disease, lipid and atherosclerosis, T cell receptor signaling pathway, C-type lectin receptor signaling pathway, rheumatoid arthritis, and malaria. The gene discussed is CLEC4D; the disease is rheumatoid arthritis.