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Strains of E. coli used
| Strain | Relevant genotype | Source |
|---|---|---|
| WP2 | trpE65 | E. M. Witkin |
| WP6 | As WP2 but polA1 | E. M. Witkin |
| WU3610 | tyrA14 leu308 | E. M. Witkin |
| CC101T | mutT::Kmr | H. Maki |
| CM1339 | As WP2 but mutT::Kmr | P1 (CC101T) × WP2 |
| CM1377 | As WP6 but mutT::Kmr | P1 (CC101T) × WP6 |
