Biology, 27.09.2019 08:20 skylarsikora22

This is one of the two main types of white blood cells that is an essential parts of the immune system and directly attacks antigens. it is produced in bone marrow, matures in the thymus, and travels in the blood to other tissues, such as the spleen, tonsils, and lymph nodes.

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This is one of the two main types of white blood cells that is an essential parts of the immune syst...