heme definition

  • noun:
    • The deep purple, nonprotein, ferrous component of hemoglobin, C34H32FeN4O4.
    • The component of hemoglobin (also hemoproteins) accountable for binding oxygen, includes an iron ion that binds oxygen and a porphyrin ring that binds the globin molecules; one molecule binds one molecule of air.
    • a complex purple organic pigment containing iron and other atoms that oxygen binds

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