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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.
moulds that generally infect the leaves of many plants, including crop plants, such as wheat and...
living ground tissue with thick-walled cells that gives strength, support and protection to a...
an autoimmune disease which is treated with insulin injections.
energy resources (coal, crude oil and natural gas) derived from the fossilised remains of plants...