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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.
cells that are formed during secondary growth by the vascular cambium ring just to the outside...
liquid which fills the spaces around the cells. It is derived from blood plasma but lacks the...
identical strands of a chromosome produced by the doubling of genetic material during cell...