An official website of the United States government
Here's how you know
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
As a library, NLM provides access to scientific literature. Inclusion in an NLM database does not imply endorsement of, or agreement with,
the contents by NLM or the National Institutes of Health.
Learn more:
PMC Disclaimer
|
PMC Copyright Notice
aDepartment of Preventive Medicine and Bacteriology, University of Virginia School of Medicine, Charlottesville, Virginia
2
At present: Laboratory of Cellular Physiology, Department of Biology, New York University.
1
This investigation was supported by a grant from the John and Mary R. Markle Foundation and conducted with the technical assistance of Carolyn Wooley Nalle.