floating sections from human brains immersed for more than forty years in formalin , or from brains freshly fixed for a short time are treated by kmno4-pal 's modified solutions to suppress the endogenous peroxidase activity before using the peroxidase-antiperoxidase method ( pap ) , or to remove the autofluorescence of lipofuscin , which is very intense in brains from old patients , before using the immunofluorescence method .
C0086418
human
C0027021
peroxidase