culturing {HEAD ~ a host} transformed by {TAIL ~ a vector} comprising a DNA segment having the following nucleotide sequence: 
transformed by
culturing { HEAD ~ a host } transformed by { TAIL ~ a vector } comprising a DNA segment having the following nucleotide sequence :
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH