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Plasmid maps of the shuttle vector and expression vectors pZGX04, pZGX04-mdh, pZGX04-fumC, pZGX04-gldA-mdh, pZGX04-gldA-fumC, and pZGX04-mdh-fumC. Shuttle vector pZGX04 was constructed by using plasmids pZGX01 and pUC18 and the chloramphenicol resistance gene. The other vectors were constructed based on pZGX04.
