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Methods to avoid immune system engulfment of NPs. (a) PEG; (b) POx; (c) zwitterionic polymers; (d) pre-coating of NPs with dysopsonins; and (e) coverage of NPs with membranes derived from cells. POx: poly(2-Oxazoline); RBC: red blood cell. The figure was partly generated using Servier Medical Art by Servier, licensed under the Creative Commons Attribution 3.0 Unported Licence.
