Activated
macrophage
Infected body cell
or tumor cell
Antigen presentation
MHC II proteins
MHC I proteins
Cytotoxic (killer)
T-Cells
Helper
T-Cells
Supressor
T-Cells
Acts as a co-
stimulator
?
Interleukin I
Interleukin II
Modulate
auto-
responses
Activated
T-Cells
Memory
T-Cells
B-Cell
response
Lymphokines
/Cytokines