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Expression of Hepatitis B Virus Surface Antigen Gene in Cultured Cells by Using Recombinant Plasmid Vectors

Department of Microbiology and Immunology, University of Colorado School of Medicine, Denver, Colorado 80262

ABSTRACT

By using a new host-vector system, expression of the gene coding for hepatitis B surface antigen has been studied. A subgenomic fragment of cloned hepatitis B viral DNA was inserted into the plasmid vector pSV010. Transfection of COS cells with the recombinant plasmid vector containing hepatitis sequences leads to the synthesis of hepatitis B surface antigen, which is released in the culture medium in the form of 22-nm particles similar to those found in the sera of hepatitis carriers.

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