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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
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physical entity go
an entity that has physical existence
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matter go
that which has mass and occupies space
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substance go
a particular kind or species of matter with uniform properties
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antigen go
any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies)
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immunogen, immunizing agent go
any substance or organism that provokes an immune response (produces immunity) when introduced into the body
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vaccine, vaccinum go
immunogen consisting of a suspension of weakened or dead pathogenic cells injected in order to stimulate the production of antibodies
poliovirus vaccine
vaccine prepared from poliovirus to provide immunity to poliomyelitis
noun.artifact

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