. Author manuscript; available in PMC: 2021 Jan 10.
Published in final edited form as: Mucosal Immunol. 2020 Jun 1;14(1):229–241. doi: 10.1038/s41385-020-0300-z
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