Of note, mutual exclusivity analysis on the basis of mutation and copy number data in the cBioPortal25, 26 revealed that CD200 exhibited significant co‐occurrence with CD47 (Figure 3C and Table 1), which implies that CD47 may disrupt phagocytic clearance of noncancer stem cells while CD200 is responsible for protecting cancer stem cells from phagocytes. The gene discussed is CD200; the disease is cancer.