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antibody	a protein in blood that reacts to particular toxic substances by neutralizing or destroying them. Antibodies provide immunity against these toxic substances.
enzyme	a protein that helps a chemical reaction take place within a living thing.
gelatin	an animal protein that is used in glue, on film, and for making things like jelly. [1/2 definitions]
soybean	the seed of this plant that is high in protein and very nutritious. [1/2 definitions]

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