Whole body irradiation is often used in {HEAD ~ the art} to create {TAIL ~ hematopoietic space} and thus promote engraftment, chimerism, and tolerance 
Whole body irradiation is often used in { HEAD ~ the art } to create { TAIL ~ hematopoietic space } and thus promote engraftment , chimerism , and tolerance
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH