In what form do antigens exist?

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(D) Antigens are substances that the body recognizes as foreign and that trigger an immune response. They can exist in various forms,including: $1$. L

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All of the above

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(D) Antigens are substances that the body recognizes as foreign and that trigger an immune response. They can exist in various forms,including: $1$. Living microorganisms (e.g.,pathogens like bacteria or viruses). $2$. Dead or inactivated microorganisms (often used in vaccines). $3$. Other proteins or molecules (such as pollen,toxins,or foreign blood cells). Therefore,all the given options are valid forms in which antigens can exist.

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