However, {HEAD ~ the inclusion} of {TAIL ~ a human gamma constant region} on a transgene is not required to achieve such maturation 
of
However , { HEAD ~ the inclusion } of { TAIL ~ a human gamma constant region } on a transgene is not required to achieve such maturation
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH