Heme
WordNet
noun
(1) A complex red organic pigment containing iron and other atoms to which oxygen binds
WiktionaryText
Noun
- The component of hemoglobin responsible for binding oxygen, consists of an iron ion that binds oxygen and a porphyrin ring that binds the globin molecules; one molecule binds one molecule of oxygen.
See also
- hemoglobin
- bilirubin
- red blood cell
- Wikipedia article on heme
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