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The lymphatic system, a part of the immune system in humans and an organ system that complements the circulatory system
Image: Ersin Arslan/Zoonar/picture allianceImage: Ersin Arslan/Zoonar/picture alliance

Immune system

The human immune system protects our bodies against germs, including bacteria, viruses, fungi and toxins. It's a complex network of organs, cells and proteins that us live healthy lives.