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Preparation of GelMA material. (A) Schematic illustration of GelMA reaction; (B) 1H NMR verification of GelMA. Peak correspond to acrylic protons (2H) of methacryloylated grafts of lysine groups. (C) GelMA gelation (L-G) with 0.5% w/v LAP cross-linked with 405 nm light for 1 min. (D) image of 3D culturing of cancer Spheroids inside of crosslinked L-G. Scale Bar, 200 μm.
