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.
The effect of sirtuin gene expression on life span. This is the graphical summary of data obtained from increased or decreased sirtuin expression in Caenorhabditis elegans. Overexpression of sirtuin genes results in increases in the life span (arrow A), whereas underexpression of these genes shortened the life span (arrow B). The time of the inflection point (circle) is shifted, but the general shape of the survival curve remains unchanged.
