In {TAIL ~ the transgenes} of the invention, {HEAD ~ the non cognate switch region} may be a switch region from a different species than the constant region coding segment 
In
In { TAIL ~ the transgenes } of the invention , { HEAD ~ the non cognate switch region } may be a switch region from a different species than the constant region coding segment
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH