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Frey, J., Deshusses, J. & Krisch, H.M. Ω mutagenesis in gram-negative bacteria: A selectable DNA fragment which terminates transcription in a wide range of bacterial species. Experientia 42, 103–104 (1986). https://doi.org/10.1007/BF01975993
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DOI: https://doi.org/10.1007/BF01975993