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The phoA expression system is an efficient one and is successfully used in foreign gene expression. In a previous study, it was found that pH during the expression phase had a significant effect on extracellular hEGF production under control of the phoA promoter by Escherichia coli DA19, an acetate-tolerant strain of E. coli DH5α, in a chemically defined medium, but the level of hEGF production was...
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