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A recombinant tandem of 'chimeric' mouse/human immunoglobulin (Ig) genes was constructed and inserted into plasmid pGEM 1 under the control of the T7 bacteriophage RNA polymerase promoter. Lymphoid (Sp2/0) and non-lymphoid (CHO) cell lines used for transfection contained in their genomes a semisynthetic gene of T7 RNA polymerase and steadily expressed this enzyme. It was shown for the first time that...