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Hydrogels used in 3D printing. (A) Schematic diagrams of the key material properties to enable the continuous 3D-printing of the bilayered hydrogel scaffold. Reproduced from Ref. [129] with permission of Wiley-VCH, © 2020. (B) Schematic and photographs showing two-photon crosslinking of a hydrogel into dermis across the epidermis. Scale bars, 100 µm. Adapted from Ref. [133] with permission of Springer Nature, © 2022.
