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.
Green L, Jutfelt F.Green L, et al. Among authors: jutfelt f.Biol Lett. 2014 Sep;10(9):20140538. doi: 10.1098/rsbl.2014.0538.Biol Lett. 2014.PMID: 25232027Free PMC article.