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