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Schematic illustration of crosslinking mechanism that used for three dimensional (3D) bioprinting of photoactive Alginate based bioink. Thiol containing molecules and Norbornene functionalized alginate (Alg-norb) can form thiol–ene crosslinking reaction under ultraviolet (UV) exposure with minimal effect on cell viability. Reproduced from Ooi et al. [129], with permission from American Chemical Society, 2017.
