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