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DNA vaccines represent a novel approach in immunology, where a plasmid containing the gene encoding an antigen from a pathogen is introduced into the host cells. Once inside the cells, the host machinery expresses the antigen, which is then presented on the cell surface via major histocompatibility complex (MHC) molecules. This _________ _________ ________ ____ ______ _______ _____ __________ ________ ____ __________ ______.
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