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(a) Schematic representation of the mechanism proposed for the multistage drug delivery by pNG‐DOX. (b) Penetration of pNG‐DOX into MCTS: Comparison of free DOX, degradable multistage pNG‐dox, and the non‐degradable control (left) and the mean fluorescence intensity of DOX over the area of the MCTS for different penetration depth (right). Reprinted with permission from Nagel et al. (2020). Copyright 2020. Ivyspring International Publisher
