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| The process by which bacteria are altered by opsonins so as to become more readily and more efficiently engulfed by phagocytes. |
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| are small cell-signaling protein molecules that are secreted by numerous cells and are a category of signaling molecules used extensively inintercellular communication |
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| The thymus is a specialized organ of the immune system. The thymus "educates" T-lymphocytes (T cells), which are critical cells of the adaptive immune system. |
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| CD4 (cluster of differentiation 4) is a glycoprotein expressed on the surface of T helper cells, monocytes, macrophages, and dendritic cells. |
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