CO poisoning reflects the role of hydrogen-bonding in the binding of O₂, a pathway mode that is incompatible with CO complexes which usually do not engage in hydrogen bonding.

Hemerythrin/HHE cation-binding domain

The hemerythrin/HHE cation-binding domain occurs as a duplicated domain in hemerythrins, myohemerythrins and related proteins. This domain binds iron in hemerythrin, but can bind other metals in related proteins, such as cadmium

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