haem

This turnover releases significant amounts of the iron-free portion of 'heme' , porphyrin, which is subsequently degraded.

The active site or prosthetic group of all the cytochromes is an iron containing porphyrin, or 'heme' .

The majority of photosensitizers are derivatives of hematoporphyrin, a synthetic porphyrin synthesized from 'heme' .

The harvested cell pellet was red, which suggested that the prosthetic group 'heme' was synthesized by the bacterium.

An iron porphyrin, called 'heme' , is the portion of hemoglobin that carries oxygen from the lungs to our body's cells.