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Common examples of physical contaminants include hair, bandages, fingernails, jewelry, broken glass, metal, paint flakes, bone, the body parts of pests, or pest droppings.
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<em>Definition. A ribosome is an intercellular structure made of both RNA and protein, and it is the site of protein synthesis in the cell.</em>
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They provide the immune system with "memory" against previously encountered pathogens.
T memory cells are necessary for protective immunity against invading pathogens
