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Copper: The New Sterling. Or was it? 
 Who doesn't love copper?
 Who DOES love copper? Octopus blood contains the copper-rich protein hemocyanin for transporting oxygen. Although less efficient under normal conditions than the iron-rich hemoglobin of vertebrates, in cold conditions with low oxygen pressure, hemocyanin oxygen transportation is more efficient than hemoglobin oxygen transportation.  | 
										 
																																																												
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