AUTHOR= Frontiers Editorial Office TITLE=Retraction: Optimizing sgRNA to improve CRISPR/Cas9 knockout efficiency: special focus on human and animal cell JOURNAL=Frontiers in Bioengineering and Biotechnology VOLUME=11 YEAR=2023 URL=https://www.frontiersin.org/journals/bioengineering-and-biotechnology/articles/10.3389/fbioe.2023.1285036 DOI=10.3389/fbioe.2023.1285036 ISSN=2296-4185