porphine or porphyrin, member of porphyrins molecule. it is heme cofactor of hemoglobin, cytochromes. molecular model. 3d

aromatic atom atomic ball carbon chemical chemistry chlorophyll cofactor cytochromes erythrocyte formula hematin heme hemoglobin hydrogen illustration macrocycles macrocyclic molecular molecule myoglobin organic oxygen porphine porphyrin protoheme render rendering structural structure tetrapyrrolic