In recombinant DNA technology for vaccine production, the gene for the antigen is often inserted into:
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Correct answer: Bacteria or yeast host cells
In recombinant DNA technology for vaccine production, the antigen-coding gene is inserted into bacteria (e.g., E. coli) or yeast (e.g., Saccharomyces cerevisiae), which act as host organisms to produce large quantities of the target protein.
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