Apparent DNA-binding protein specific for cells transformed by avian acute leukemia viruses

An apparent DNA-binding protein is described that is specific for cells transformed by avian acute leukemia viruses. This protein cannot be demonstrated in cells transformed by any of the avian sarcoma viruses or in cells infected with nontransforming avian retroviruses. The protein also is not detectable in noninfected quail or chicken embryo primary cultures or in noninfected chicken hematopoietic cells. The apparent molecular weight of this protein is 105,000 and it is referred to as DBP105.