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