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We observed that overexpression of Cre recombinase in 293 T cells has toxic effects and that the chicken β-actin promoter is active in Escherichia coli, causing expression of Cre in bacteria. This led to significant problems in the cloning of Cre/loxP constructs. Leaky Cre-expression in E. coli, and toxicity of the Cre overexpression in mammalian cells, were solved by constructing a novel silent self-inactivating...
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