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Functionalization of GO. Organic and inorganic were the two major sets. Organic set was further divided into linear polymers, nonlinear polymers, polysaccharides, amino acids-protein-aptamer (APA), and nonpolymers (not show). The subgroups which had passed the in vivo antitumor assay were red labeled. Blue stars indicated the gene delivery have been realized. Inorganic and APA have not undergone these screen cause of its complexity.
