Transgenic animals for producing {HEAD ~ specific isotypes} of human antibodies via {TAIL ~ non cognate switch regions} 
Transgenic animals for producing { HEAD ~ specific isotypes } of human antibodies via { TAIL ~ non cognate switch regions }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL