Most tumor cells over‐express CD47 protein on their cytomembrane like a “don't eat me” signal to help themselves escape from macrophage capture (Figure S10, Supporting Information).28 However, apoptotic cancer cells are supposed to express “eat me” signals, such as phosphatidylserine, for the easy uptake by macrophages.[qv: 28c] CD47 protein and phosphatidylserine on cytomembranes were thus stained to compare the ratios in the mean fluorescence intensity among live 4T1 cells, MFe@M, and apoptotic 4T1 cells (Figure S10, Supporting Information). Here, CD47 is linked to cancer.