In the training dataset GSE37250 and the external test dataset GSE19439, five characteristic genes (CYBB, IL15, KCNJ2, OSM, and TLR2) presented higher expression in ATB than that in LTBI (Figures 4(a) and 4(b)), indicating their potential role in the development of TB. The gene discussed is KCNJ2; the disease is tuberculosis.