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(A) A schematic illustration of the construction of PLL-modified PHBV-HABR nanofibrous scaffolds for bone tissue engineering. Reproduced with permission from Ref. [312], copyright 2018, Elsevier. (B) PLL or poly(d-lysine)-grafted poly(propylene fumarate) polyurethane films selectively promote M2 polarization of macrophages. Reproduced with permission from Ref. [320], copyright 2020, Elsevier.
