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(A) Schematic illustration of pH-responsive scaffolds. (1 and 2). Site-specific chemotherapeutic releases at low and high pH, respectively. (B) Photo-induced cleavage (1 and 2), isomerization (3), and heat change (4) in chemotherapy drug-loaded light-sensitive scaffolds. (C) Magnetic scaffolds for tumor suppression. (D) Ion force-triggered scaffolds. Red-colored balls represent anticancer drugs. Reproduced with permission [8]. Copyright 2021, MDPI.
