The recombinant transfection system 22, wherein {HEAD ~ the transcriptional regulatory sequence} is {TAIL ~ a conditional transcriptional regulatory sequence} 
The recombinant transfection system 22 , wherein { HEAD ~ the transcriptional regulatory sequence } is { TAIL ~ a conditional transcriptional regulatory sequence }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL