Final answer:
The source of antibodies used in the Neutralization Test comes from the immune system of an organism that has been previously exposed to the antigen.
Step-by-step explanation:
In the Neutralization Test, the antibodies used come from the immune system of an organism that has been previously exposed to the antigen. When a pathogen enters the body, the immune system produces specific antibodies to neutralize it. These antibodies are then collected and utilized in the neutralization test for diagnostic purposes.
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