heme b, haem b, protoheme ix molecule. it is component of hemoglobin, myoglobin, peroxidase and cyclooxygenase families of enzymes

atom atomic bilirubin blood carbon catalase cell chain chemical chemistry compound cyclooxygenase cytochrome education element enzyme erythrocyte formula haem heme hemoglobin hemoprotein hydrogen illustration isolated macromolecule metalloprotein model molecular molecule myoglobin nitrogen organic oxygen oxygenase peroxidase porphyrin protoheme science spleen structure study vector