In the case of NK cells, we observed strong expression of NK cell marker genes KLRD1, LAIR1, CCR6, and TNFRSF9. Single cancer cells showed TNBC marker genes HMGA1, ANKRD11, and TACSTD2 (Fig. 1b) when analyzed using SCANPY33 toolkit for analyzing single-cell gene expression data. The gene discussed is KLRD1; the disease is cancer.