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Why don't lymphocytes need to be produced in response to an infection?

Why is there a time lag between exposure to a pathogen + overcoming it?

Self cells are recognised where?

Self-antigens are recognised where?

What happens if a lymphocyte has a receptors that fit the bodys cells proteins?

So the remaining lymphocytes...

What happens in adults if a lymphocyte has receptors that fit self-antigens?

Apoptosis prevents...

If the first line defence (physical/chemical barriers) fail, what occurs next?

What is a phagocyte?