Biology for IGCSE & O level - Diseases And Immunity (Section 1 - No. 48)
Which of the following is a key characteristic of an antigen?
It is produced by antibodies.
It is a foreign substance that triggers an immune response.
It is a type of white blood cell.
It is the same for all pathogens.
Explanation
Antigens are foreign substances that stimulate an immune response.
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