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PCR product of recombinant BCG plasmid
Lanes 1–4 are the PCR product: 1–3, recombinant BCG that secretes human IFNα-2b (rBCG-IFNα-2b); 4, recombinant BCG containing empty vector (pBCG). The size of the PCR product was about 519 kb, which is the same size as IFNα-2b
