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Effect of DMPH4 concentration on the synthesis of 5-HTP, using the E. coli whole cell reaction.Open circles, l-tryptophan hydroxylation using E. coli tnaA disruptant expressing PAH gene alone; filled circles, l-tryptophan hydroxylation using E. coli tnaA disruptant expressing the genes encoding PAH, PCD, DPR, and GDH.
