An iron-containing compound of the porphyrin class that forms the nonprotein part of hemoglobin and some other biological molecules.
- ‘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.’
- ‘An iron porphyrin, called heme, is the portion of hemoglobin that carries oxygen from the lungs to our body's cells.’
- ‘The harvested cell pellet was red, which suggested that the prosthetic group heme was synthesized by the bacterium.’
- ‘The majority of photosensitizers are derivatives of hematoporphyrin, a synthetic porphyrin synthesized from heme.’
1920s: back-formation from hemoglobin.
We take a look at several popular, though confusing, punctuation marks.