In {HEAD ~ one aspect}, the endogenous PUFA PKS system has been modified by mutagenesis of a nucleic acid sequence that encodes {TAIL ~ at least one domain} of the endogenous PUFA PKS system 
In { HEAD ~ one aspect } , the endogenous PUFA PKS system has been modified by mutagenesis of a nucleic acid sequence that encodes { TAIL ~ at least one domain } of the endogenous PUFA PKS system
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH