For {HEAD ~ expression} in Saccharomyces, {TAIL ~ the plasmid} YRp7, for example, is commonly used 
in
For { HEAD ~ expression } in Saccharomyces , { TAIL ~ the plasmid } YRp7 , for example , is commonly used
OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH