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When functioning optimally, the immune system is a finely tuned orchestra of different cell types interacting in harmony to protect humans from disease. The immune system not only protects humans from invasion of pathogens, but also eliminates toxins and cancer cells. The most obvious immune system organ is skin that contains immune cells (Langerhans cells) in the epidermis. The thymus (adjacent to the heart) produces thymocytes (T cells). Leucocytes, present in the blood, represent different cell types including antibodies (B cells), macrophages, phagocytes, and neutrophils. The spleen filter
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