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(A) Scheme of the synthetic route for the synthesis of gelatin methacryloyl (GelMA) and (B) 1H-NMR spectrum of GelMA in which the peaks relative to hydrophobic alkyl side chains of valine (Val), leucine (Leu), and isoleucine (Ile) and methacrylamide substituent groups of lysine (Lys) and hydroxylysine (Hly) amino acids are shown.
