immune system

Immune System – a complex system of cellular and molecular components whose primary function is distinguishing self from nonself and defense against foreign organisms or substances; see also immune response. The primary cellular components are lymphocytes and macrophages, and the primary molecular components are antibodies and lymphokines; granulocytes and the complement system are also involved in immune responses but are not always considered part of the immune system per se.

Source: https://medical-dictionary.thefreedictionary.com/immune+system

 

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