. Author manuscript; available in PMC: 2020 Sep 26.
Published in final edited form as: Nat Microbiol. 2020 Mar 26;5(4):620–629. doi: 10.1038/s41564-020-0692-2
Users may view, print, copy, and download text and data-mine the content in such documents, for the purposes of academic research, subject always to the full Conditions of use:http://www.nature.com/authors/editorial_policies/license.html#terms