Page 91 - The Miracle in the Immune System
P. 91
Cells On Duty In The System 89
AT cell (left) can get
orders to kill from a
dendritic cell (bottom
left, background) or a
macrophage (bottom
right).
cells, and suppressor T cells. Every T cell has a special
MHC molecule enabling it to recognise the enemy.
Helper T Cells
These cells can be regarded as the administrators of
the system. In the initial stages of war, they decipher the
properties of the foreigner cells absorbed by the ma-
crophages and other antigen catcher cells. After they
receive the due signal, they stimulate killer T and B cells
to fight. This stimulation causes B cells to produce
weapons called antibodies.
Helper T cells secrete a molecule called lymphokine
to stimulate other cells. This molecule somehow turns
on a switch in other cells and starts off the war alarm.
