contamination of the investigated samples with hemoglobin , peroxidase , catalase , cytochrome p-420 , cytochrome p-450 or culture medium hemoproteins was ruled out by filtering the cells and mitochondrial membranes on sephadex g-50 , or by differential spectroscopy of pigments , or by differential centrifugations of samples .
C0010762
cytochrome p-450
C0018974
hemoproteins