{HEAD ~ Either} of {TAIL ~ the aforementioned transgenic non human animals} can be bred with animals having inactivated heavy and light chain loci to produce a transgenic non human animal that produces a fully human antibody and is incapable of producing an endogenous antibody 
of
{ HEAD ~ Either } of { TAIL ~ the aforementioned transgenic non human animals } can be bred with animals having inactivated heavy and light chain loci to produce a transgenic non human animal that produces a fully human antibody and is incapable of producing an endogenous antibody
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