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(A) Layered printing to achieve vascularized skin. (B) The advantage of digital light processing 4D printing is that on the basis of digital light processing 3D printing, one material is used to manufacture structures with multiple curvatures. Reprinted with the permission from Elsevier (Kim et al., 2020; Su et al., 2020). With the permission from Elsevier. Reprinted from Barros et al. (2020) and Kim et al. (2020).
