by competition radioimmune assays with antisera against akr murine leukemia virus ( mulv ) gp 71 or antisera against xenotropic virus , and iodinated akr mulv gp71 or balb ( x ) gp71 , antigens serologically indistinguishable from the viral antigens can be detected in tissues of normal mice in the absence of overt virus expression .
C0003320
antigens
C0003342
viral