CD47 and neoplasm: functionalized an M1 macrophage‐derived exosome nanoplatform with antisignal‐regulatory protein α antibody (αSIRPα) and αCD47 using a pH‐responsive benzoic‐imine linker.[130] The αCD47‐conjugated M1 exosome displayed an impressive tumor‐targeting ability by specifically recognizing CD47 expressed on the surface of tumor cells.