AUTHOR=Calvo Olga , Ansari Athar , Navarro Francisco TITLE=Editorial: The Lesser Known World of RNA Polymerases JOURNAL=Frontiers in Molecular Biosciences VOLUME=8 YEAR=2021 URL=https://www.frontiersin.org/journals/molecular-biosciences/articles/10.3389/fmolb.2021.811413 DOI=10.3389/fmolb.2021.811413 ISSN=2296-889X