the complex relationships of the many different actors of the immune system, with countless exceptions and unintuitive rules, are a challenge all by themselves. Immunology is hard even for the people working in public health, even for the people studying immunology, even for the foremost experts in the field. All of this makes the immune system horrible to explain. If you venture too far into simplification you deprive the learner of the beauty and wonder that lie in the evolutionary genius of the sheer endless complexity that deals with the most crucial problems of living beings. But if you
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