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An immunogen is a substance capable of eliciting a specific immune response and reacting with the products of that response. One of the most important traits of an immunogen is foreignness. Substances recognized as non-self by the host immune system are more likely to induce an immune response, whereas self molecules are usually tolerated. Another essential trait is molecular size. Generally, large _____ ___ _____ _____ ___ ____ ______ ___ ____ ______ _________ ________.
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