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.
Levine JD, Clark R, Devor M, Helms C, Moskowitz MA, Basbaum AI.Levine JD, et al. Among authors: helms c.Science. 1984 Nov 2;226(4674):547-9. doi: 10.1126/science.6208609.Science. 1984.PMID: 6208609
Green PG, Basbaum AI, Helms C, Levine JD.Green PG, et al. Among authors: helms c.Proc Natl Acad Sci U S A. 1991 May 15;88(10):4162-5. doi: 10.1073/pnas.88.10.4162.Proc Natl Acad Sci U S A. 1991.PMID: 2034661Free PMC article.
Levine JD, Coderre TJ, Helms C, Basbaum AI.Levine JD, et al. Among authors: helms c.Proc Natl Acad Sci U S A. 1988 Jun;85(12):4553-6. doi: 10.1073/pnas.85.12.4553.Proc Natl Acad Sci U S A. 1988.PMID: 2837769Free PMC article.
Landis CA, Robinson CR, Helms C, Levine JD.Landis CA, et al. Among authors: helms c.Brain Res. 1989 May 29;488(1-2):195-201. doi: 10.1016/0006-8993(89)90709-9.Brain Res. 1989.PMID: 2743114