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  1. Immune system - Wikipedia

  2. Immune System Function, Conditions & Disorders - Cleveland Clinic

  3. The immune system: Cells, tissues, function, and disease

  4. Overview of the Immune System - Overview of the Immune System

  5. Immune system | Description, Function, & Facts | Britannica

  6. The Immune System - Johns Hopkins Medicine

  7. Overview of the Immune System - The Merck Manuals

  8. In brief: How does the immune system work?

  9. Overview of the Immune System - National Institute of Allergy …

  10. Physiology, Immune Response - StatPearls - NCBI Bookshelf