. Author manuscript; available in PMC: 2020 Apr 21.
Published in final edited form as: Nat Microbiol. 2019 Oct 21;4(12):2393–2404. doi: 10.1038/s41564-019-0590-7
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