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Schematic representation of targeting ligands and their receptors or targeting sites on the PAMAM DDS. NRP-1: neuropilin 1; MMP-2: matrix metalloproteinase-2; METr: mesenchymal transition factor receptor; Tfr: transferrin receptor; FAr: folic acid receptor; CTX: chlorotoxin; Tf: transferrin; FA: folic acid; PMPC: poly (2-methacryloyloxyethyl phosphorylcholine); BMP: bacterial magnetic nanoparticles; LRP 1: low-density lipoprotein receptor-related protein 1.
