Immune System
Which of the following(s) is/are the determinants of antigenicity?

Size of the antigen
Chemical nature
All of these
Foreignness

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Immune System
Which of the following is correct for isoantigens?

They are antigens found in some members of a species
They are antigens found in all members of a species
They are antigens found in all members of different species
They are antigens found in some members of different species

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