Such an assay may be particularly useful in view of evidence that {HEAD ~ transgenes} have {TAIL ~ a tendency} to become transcriptionally inactivated over the generations 
have
Such an assay may be particularly useful in view of evidence that { HEAD ~ transgenes } have { TAIL ~ a tendency } to become transcriptionally inactivated over the generations
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 OTH OTH OTH OTH OTH