The presence of the trpl lesion as a characteristic of the yeast host cell genome than provides {HEAD ~ an effective environment} for detecting {TAIL ~ transformation} by growth in the absence of tryptophan 
for detecting
The presence of the trpl lesion as a characteristic of the yeast host cell genome than provides { HEAD ~ an effective environment } for detecting { TAIL ~ transformation } by growth in the absence of tryptophan
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH