heme b (haem b) molecule. heme is an essential component of hemoglobin, myoglobin, cytochrome, catalase and other metalloproteins

heme haem blood iron ferrous porphyrin metalloprotein hemoprotein hemoglobin myoglobin cytochrome catalase oxygenase spleen red cell erythrocyte bilirubin hydrogen carbon oxygen nitrogen molecule atoms atomic model molecular compound composition chemical chemistry bond structure formula