Table I. Escherichia coli strains.
| Designation | Sex, extrachromosomal markers | Chromosomal markers | Origin |
|---|---|---|---|
| MG1655 | F– | wild type | D.Touati |
| MG1655-Δlac | F–Δlac | ||
| Wt/Δ14 | F′proAB lacIZYA | ara argE Δ (lac proAB)gyrA thi | L.A.Isaksson |
| Wt/U4 | F′proAB lacI(UGA)ZYA | ara argE Δ (lac proAB)gyrA thi | L.A.Isaksson |
| S12/Δ14 | F′proAB lacIZYA | as above, rpsL141 | L.A.Isaksson |
| S12/U4 | F′proAB lacI(UGA)ZYA | as above, rpsL141 | L.A.Isaksson |
| S4/Δ14 | F′proAB lacIZYA | as above, rpsD12 | L.A.Isaksson |
| S4/U4 | F′proAB lacI(UGA)ZYA | as above, rpsD12 | L.A.Isaksson |
| ÅF1 | F– | MG1655Δlac rpsL141 | this work |
| ÅF2 | F– | MG1655Δlac rpsL141groELp::lacZ | this work |