Immunology is the study of the biological defense system (immune system) of more highly developed organisms such as humans. The immune system protects us and our tissues from pathogens such as bacteria, viruses and fungi.
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But our system also fends off foreign substances, such as biological poisons (toxins) and environmental toxins. In addition, it recognizes defective endogenous cells, which it destroys. Since our immune system plays a central role in many diseases, the study of immunobiology for health maintenance, diagnostics and therapy in medicine is a major focus.
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