Question

which antibody present against antigen A ?

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Answer 1

Answer:

Antigens are molecules capable of stimulating an immune response. Each antigen has distinct surface features, or epitopes, resulting in specific responses. Antibodies (immunoglobins) are Y-shaped proteins produced by B cells of the immune system in response to exposure to antigens.

Answer 2

Answer:

A antigen. In case of any doubt you can google as well:)