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GREG WILLIAMS / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY GREG WILLIAMS / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY
Ferritin is the protein that stores iron in higher organisms. Ferritin is hollow and roughly spherical, with channels that pass through the wall, somewhat analogous to a molecular whiffle ball. The inside cavity of the protein is large enough to store more than 4,000 iron atoms as an iron(III) oxide.
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