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a foreign substance, usually a protein, that stimulates the production of one or more antibodies. The foreign substance, which could be a virus, bacterium or toxin, can be from the external environment or from within the body.
outer body tissue layer that forms the epithelium and nervous tissue.
modified phloem parenchyma cells that help translocate food substances in the plant.
is the supply of materials, in the form of food, required by organisms and cells to stay alive...