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(A) Structure of inorganic/organic hybrid. (B) Structure of penetration behavior of virus-mimicking nanoparticles (MSN-NH2@COOH/CPP5). (C) Structure of HAP-PEG-GA-INS NPs and schematic diagram of insulin delivery to the effector cells by HAP-PEG-GA-INS NPs. (D) Structure and synthesis of the MSNs core–shell nanoparticles (a) and its pH- and glucose-sensitive behavior (b).
