A type of iron-binding protein found in marine bristle worms (chaetopterid worms) that helps transport oxygen in their blood.
Derived from Chaetopterus (a genus of bristle worms) with the suffix '-in,' used in biochemistry to name specific proteins.
Chaetopterin is so good at binding iron that scientists are studying it to create better medical treatments—imagine harnessing a worm's oxygen-carrying molecule to help people with blood disorders.
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