The two key organs in the body's immune system are the thymus gland and white blood cells.

Name: The two key organs in the body's immune system are the thymus gland and white blood cells.
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While white blood cells are a critical component of the immune system, the thymus gland plays a role in the development and maturation of T cells, a type of white blood cell. However, there are many other organs, tissues, and cells that make up the immune system.

The Two Key Organs in the Body's Immune System Are