Question

Why don't we worry about the potential presence of B cells that recognize host antigens?

Answer 1

Answer:

The T- and B-cells recognize invaders by the shape of molecules - antigens - on their surfaces. The immune system can produce a T- and B-cell to fit every possible shape. However, any T- or B-cell that recognized molecules found on cells were destroyed while in the womb, to prevent them from attacking own body.

With the help of T-cells, B-cells make special Y-shaped proteins called antibodies. Antibodies stick to antigens on the surface of germs, stopping them in their tracks, creating clumps that alert your body to the presence of intruders. Our body then starts to make toxic substances to fight them. Patrolling defender cells called phagocytes engulf and destroy antibody-covered intruders.