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 An open clamshell shows the clam’s red color. The clams contain a modified type of hemoglobin—the same protein that makes human blood red—to distribute oxygen, carbon dioxide and hydrogen sulfide to microorganisms that live within its tissue.


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An open clamshell shows the clam’s red color. The clams contain a modified type of hemoglobin�the same protein that makes human blood red�to distribute oxygen, carbon dioxide and hydrogen sulfide to microorganisms that live within its tissue.

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