An official website of the United States government
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
LockA locked padlock
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Image Number D3594-1
Technician April Stanley retrieves specimens from a liquid-nitrogen freezer.
Photo by Katherine Smith.
640 pixels wide: (d3594-1.jpg)
Please visit our Image Gallery.