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