Thymus, A specialized, two-lobed lymphoid organ located in the upper chest behind the breastbone that matures T-cells, Spleen, Acts as a vital part of the immune system by filtering blood, Bone Marrow, A soft, spongy tissue found in the center of bones that produces blood cells, Lymphocytes, A specialized white blood cells acting as a cornerstone of the adaptive immune system, Skin, It acts as the body's largest organ and a crucial first-line component of the innate immune system.

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