Medical Terminology / Unit 8 MedTerm 0493 short lesson, about 20 seconds
An Antigen
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The idea
An antigen is any substance the body recognizes as foreign and responds to.
In practice
A protein on the surface of a bacterium can act as an antigen.
Where people slip
An antigen provokes the response. A different substance carries it out.
Your place on the trail
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Builds on
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