. Author manuscript; available in PMC: 2021 Jun 18.
Published in final edited form as: Nat Microbiol. 2020 Dec 18;6(1):73–86. doi: 10.1038/s41564-020-00841-4
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