Correlating the level of SUSD4 expression seen in blue to the left in each panel, with the color-annotated breast cancer subsets (Fig. 7F) or color-annotated stromal cell subsets (Fig. 7G), shows that SUSD4 is expressed by breast cancer epithelial cells of the various subtypes of breast cancer, but not by the stromal cells. Here, SUSD4 is linked to breast cancer.