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Growth of the E. coli K-12 Δznu ΔzupT mutant QT1435 containing plasmid-encoded metal transporters in DT-EGTA medium (a) or DT-EGTA with 5 μM Zn2+ (b). Symbols: ⧫, QT1435(pACYC184) (vector control); ▴, QT1435(pIJ202) zupT; ▪, QT1435(pIJ156) znuACB; ▾, QT1435(pIJ28) sitABCD.
