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.
Age associated accumulation of CD28− T cells. A schematic presentation of the accumulation of CD28− T cells with age for both CD4 and CD8 T cells. The ordinate indicates the frequency of CD28− CD4 or CD28− CD8 T cells. CD28− CD8 T cells show a dramatic increase in number with age whereas the increase of CD28− CD4 T cells is much more modest.
