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Plasmids have been constructed that direct the synthesis in Escherichia coli of heavy chains and/or light chains of an anti-carcinoembryonic antigen (CEA) antibody. Another plasmid was constructed for expression of a truncated form of heavy chain (Fd' fragment) in E. coli. Functional CEA-binding activity was obtained by in vitro reconstitution in E. coli extracts of heavy chain or Fd' fragment mixed with extracts containing light chain.
Cabilly et al. (Fri,) studied this question.