An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Liu TY, Watson BO.Liu TY, et al. Among authors: watson bo.Philos Trans R Soc Lond B Biol Sci. 2020 May 25;375(1799):20190233. doi: 10.1098/rstb.2019.0233. Epub 2020 Apr 6.Philos Trans R Soc Lond B Biol Sci. 2020.PMID: 32248782Free PMC article.Review.