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PD-L1CD80 cis-heterodimer formation preferentially blocks CTLA-4 trans-signaling while allowing CD28-mediated effector T cell activation.[This corrects the article DOI 10.1021/acsomega.0c04300.].We have designed a new magnetic targeting drug carrier Fe3O4-PVA with a core of triiron tetroxide (Fe3O4) and a shell made of polyvinyl alcohol (PVA) to improve the hydrophilicity of Fe3O4. With adriamycin hydrochloride as a model drug, this study goes on to measure the drug carrier performance of Fe3O4-PVA. In addition, the thermal stability and e