[Electron-cytochemical study of cerebral mitochondria at different periods after death].

3'3'-diaminobenzidine (DAB) oxidation was studied in the human and rat brain by electron cytochemistry at different periods after death. The product of DAB oxidation localized in mitochondria, lipofucsin pigment granules and erythrocytes. DAB oxidation by rat and human brain mitochondria proved to decrease but slightly even two days after death.