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| Description: (a) Blue arrows (right side): External components of the innate immune system: human body with skin, mucous and the associated cilia, earwax, lysozyme in tears; the acid pH of sweat, stomach acids, urine, and vagina fluids; and the normal bacteria of the skin and gastrointestinal tract labeled. (b) Red arrows (left side): organs of the acquired immune system: tonsil, lymph node, thymus, spleen, Peyer's patches, lymphatics, bone marrow.
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