Table 1.

Change in phenylalanine content in vitro solutions under various treatments

Experimental conditions	Treatment	Decrease in phenylalanine, % control†
Control	Nonrecombinant E. coli cells	0
	Chymotrypsin	0
	Intestinal fluid	0
PAL	In induced recombinant E. coli cells	76
	In induced recombinant E. coli cells + chymotrypsin in medium	72
	In induced recombinant E. coli cells + intestinal fluid in medium	66

^*Treatments were for 1 h followed by measurement of l-phenylalanine content. 

^†Initial concentration, 4 mM of l-phenylalanine.