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The horseshoe crab,Limulus polyphemus, employs hemocyanin as an oxygen carrier in its hemolymph. This hemocyanin displays cooperative oxygen binding and heterotropic allosteric regulation by protons, chloride ions and divalent cations. Here, we report the crystal structure ofLimulus polyphemussubunit type II hemocyanin with a nitrate ion bound in the interface of its first and second domains. Interestingly,...
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