What is the base metal of squids blood?

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Rebecca C

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Human blood is iron based, what metal is the base metal of squids blood?

please include reference if possible
 
Many other mollusks have blood like cephalopods; it is a fairly common trait for members of the phylum. Their blood is copper based which gives it a light blue color when it is holding oxygen. Our blood is red when holding oxygen as we have an iron based pigment.
 
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