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Reference.org
Metalloprotein
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<p>Metalloprotein is a generic term for a <a href="/facts/Protein/Jxmagu3E">protein</a> that contains a metal ion <a href="/facts/Cofactor_(biochemistry)/AGo0PCUU">cofactor</a>. A large proportion of all proteins are part of this category. For instance, at least 1000 human proteins (out of ~20,000) contain zinc-binding <a href="/facts/Protein_domain/oUpFcSsl">protein domains</a> although there may be up to 3000 human zinc metalloproteins. </p>