occurs in the chlorophyll of plants, the hemoglobin of blood and many enzymes which, like hemoglobin, take part in respiration ...

including increased hemoglobin and iron metabolism. 11 These results would be expected especially since the derivative of chlorophyll used in the study contained iron instead of another mineral ...

Hemoglobin is a porphyrin that lends blood its red color; chlorophyll, the pigment in green plants, is a chlorin; and the pigments in purple photosynthetic bacteria are bacteriochlorins.