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