Every mature T cell wears one of two badges. CD4 cells help, and they give the orders. CD8 cells kill. Step through one infection below and watch the hand-off. Then pull the CD4 count down and see how much of the response goes with it.
Step 1 of 5antigen arrives
CD4 count
800
Cytokine output
0%
Antibody output
0%
Infected cells killed
0 of 6
The rule of eightwhich cell reads which tray
Rule of eight. CD4 times MHC II is eight. CD8 times MHC I is eight. Each T cell pairs with the tray whose number multiplies out to eight.