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What does the immune system do?

What does an immnue response always involve?

What are white blood cells able to do?

What happens when they detect something?

What is an antigen?

What are anitbodies?

What do anitbodies do once they have latched on?

What does White blood cell do one antigen is recognised?

What happens to cells after original infection has gone?

What is the purpose of a memory cell?