In the seventh aspect, the invention features a method for constructing {HEAD ~ a nematode} having {TAIL ~ a genetic deletion} in a region of choice 
having
In the seventh aspect , the invention features a method for constructing { HEAD ~ a nematode } having { TAIL ~ a genetic deletion } in a region of choice
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH