formalin-fixed , paraffin-embedded autopsy sections of brains from two patients with progressive multifocal leukoencephalopathy ( pml ) were stained by peroxidase-antiperoxidase methods for human papovavirus t antigen , a nonstructural protein expressed in cells lytically infected or transformed by jc , bk , and sv40 viruses .
C0006104
brains
C0023524
progressive multifocal leukoencephalopathy