AUTHOR=Gentile Piergiorgio , De Giglio Elvira , Hilborn Jons Gunnar , Ng Kee Woei TITLE=Editorial: Composite and Functionalized Hydrogels: Implications for Improved and Biological Properties in Tissue Engineering JOURNAL=Frontiers in Bioengineering and Biotechnology VOLUME=8 YEAR=2021 URL=https://www.frontiersin.org/journals/bioengineering-and-biotechnology/articles/10.3389/fbioe.2020.636575 DOI=10.3389/fbioe.2020.636575 ISSN=2296-4185