haem
/hiːm/IPA: /HH EH1 M/
noun
- 1
The component of hemoglobin (and other hemoproteins) responsible for binding oxygen. It consists of an iron ion that binds oxygen and a porphyrin ring that binds the globin molecules; one molecule binds one molecule of oxygen.
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Source: https://en.wiktionary.org/wiki/haem, https://en.wiktionary.org/wiki/heme