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For cloning and expressing the antigen-binding variable (Fv) portion of an antibody in Escherzchia coli, vectors have been constructed that combine the two variable regions (V(H) and V(L)) with a peptide linker (1-3). The genetic information for V(H) and V(L) is generally amplified from hybridoma cells using the polymerase chain reaction (PCR) with antibody-specific primers A variety of primer sets for the amplification of mouse-variable domams has been developed that are particulary suitable for the generation of complex mouse libraries consisting of more than 10(5) different antibody sequences (4,5)...