{TAIL ~ This plasmid} already contains {HEAD ~ the trpl gene} which provides a selection marker for a mutant strain of yeast lacking the ability to grow in tryptophan, for example ATCC No 44076 or PEP4 1  
{ TAIL ~ This plasmid } already contains { HEAD ~ the trpl gene } which provides a selection marker for a mutant strain of yeast lacking the ability to grow in tryptophan , for example ATCC No 44076 or PEP4 1
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH