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.
Elevated indoleamine 2,3-dioxygenase (IDO) enzymatic activity in brain of aged mice in response to peripheral lipopolysaccharide (LPS) injection. Young adult and aged mice were injected i.p. with either saline or LPS and IDO activity was measured in whole brain collected 24 h later. Bars represent the mean ± SEM (n = 6). Means with (*) are significantly different (P<0.05).
