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1. A chemical compound of a type known as a prosthetic group consisting of an iron ion contained in the centre of a large heterocyclic organic ring called a porphyrin, made up of four pyrrolic groups joined together by methine bridges. (

2. The component of hemoglobin (and other hemoproteins) 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. (

3. A complex red organic pigment containing iron and other atoms to which oxygen binds. (

4. An iron-containing compound of the porphyrin class that forms the nonprotein part of hemoglobin and some other biological molecules. (Google Dictionary)

5. A family of proteins found in blood and milk and muscle and in plant seed. (

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