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.
Hardy RN, Hockaday AR, Tapp RL.Hardy RN, et al. Among authors: tapp rl.Philos Trans R Soc Lond B Biol Sci. 1971 Feb 11;259(834):517-31. doi: 10.1098/rstb.1971.0002.Philos Trans R Soc Lond B Biol Sci. 1971.PMID: 4398728No abstract available.