On the Cytochromes of Anaerobically Cultured Yeast 235 



band is much stronger than in other strains examined. While the properties of the 

 pigment resemble those of haemoglobin, it is conceivable that it has some oxidase 

 activity as well. The study of the isolated pigment would be of considerable interest. 



Morton: A pigment somewhat resembling that described by Keilin and Tissieres was 

 observed by Martin and myseU (Bioclieni. J. 65, 404, 1957) in plants. 



Strittmatter : The properties of the 575 m/{ band resemble those of the similar band, 

 which may well be due to adsorbed oxyiiaemoglobin, that is seen in liver microsomes 

 if care is not taken to exclude or remove contaminating blood pigments during prepar- 

 ation of the microsome fraction (Strittmatter and Ball, Froc. nat. Acad. Sci. Wash. 

 38, 19, 1952; /. ceU. comp. Physiol. 43, 57, 1954; Paigen, Biochem. biophys. Acta 19, 

 297, 1956). 



H.E. — VOL. I — R 



