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