摘要：

The relative ability of the 10 triplet repeat sequences to be expanded in Escherichia coli was determined. Surprisingly, CTG tracts are expanded at least 8 times more frequently than any of the other nine triplets. Low levels of expansion were found also for CGG, GTG, and GTC. Thus, the structure of the CTG repeats and/or their utilization by the DNA synthetic systems in vivo must be quite...

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