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.
Greenwald I, Kovall R.Greenwald I, et al.WormBook. 2013 Jan 17:1-28. doi: 10.1895/wormbook.1.10.2.WormBook. 2013.PMID: 23355521Free PMC article.Review.
Chen N, Greenwald I.Chen N, et al. Among authors: greenwald i.Dev Cell. 2004 Feb;6(2):183-92. doi: 10.1016/s1534-5807(04)00021-8.Dev Cell. 2004.PMID: 14960273Free article.