Figure 1From: Enhanced synthesis of 5-hydroxy-l-tryptophan through tetrahydropterin regeneration Degradation of l -tryptophan and 5-HTP using E. coli cells. Open circles, l-tryptophan using wild-type E. coli; filled circles, l-tryptophan using E. coli tnaA disruptant; open squares, 5-HTP using wild-type E. coli; filled squares, 5-HTP using E. coli tnaA disruptant.Back to article page