Any substance that antagonizes or stimulates the immune
system to produce antibodies (see) (i.e., proteins that fight antigens).
Antigens are often foreign substances such as bacteria or viruses that invade
Antigen (adjective Antigenic):SFAF
any agent or substance that stimulates
an immune response. Antigens are often foreign microorganisms such as
bacteria or viruses, or the substances they produce.
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