Page 89 - The Miracle in the Immune System
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Cells On Duty In The System 87
A cell destroying itself (middle). This programmed self-
destruction is for the replacement of tissues or the elimi-
nation of damaged cells.
The recognition of enemy cells alone does not en-
sure the survival of T cells. These cells must also have a
very good knowledge of the harmless substances and the
regular tissues of the human body so to as prevent un-
necessary conflict, which will eventually harm the body.
The T Cell's Differentiation
According To The Order It Receives
The war has not yet ended for the T cells. Some T
cells-to-be destroy themselves after receiving a specific
signal from other cells.
There is very limited information on the signals that
cause the cells to die a programmed death, to continue
to live, or to mature and transform themselves. From a
scientific point of view, this remains one of the unsolved
mysteries of the defence system. Many similar cells in
