Ihe expenmental evidence foi the existence of human Β cells that recognize foieign antigen in the conlexl of the MHC is very restnrted not lo say limited to only one example (Van Leeuwen et al 1979) at least with legatd to the known nature of the MHC allele and the antigen mvolved On the other hand in exenmental animal modeis, the number of antigen specific MHC restricted antibodies leported (s...