278 



Riboflavin mononucleotide (FMN) 



Fig. 10-7. Riboflavin coenzymes. The atoms which acquire 

 hydrogens on reduction are starred. 



5. Iron Porphyrin Compounds. A number of enzymes such as catalase 

 and peroxidase have iron porphyrin compounds as the prosthetic group. 

 The cytochromes, a group of pigments present in a large number of 

 organisms and tissues, are also of this type, since they consist of a char- 



