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Enhancement of monensin titers by either pZC32 plasmid-based expression of mutAB or addition of exogenous dl-valine. A, meaA mutant (WM2); B, WM2/pZC32; C, meaA icm mutant (WD2); D, WD2/pZC32; E, WD2 cells grown in the presence of 0.1 M dl-valine; F, WD2 cells grown with 0.8 M dl-valine.
