The complete 24 unit human ferritin structure
Spin the protein:
See the back half of the ferritin shell:
See a single slice through the middle of the shell:
Highlight one of the 24 subunits:
Highlight one of the four-fold-symmetric channels:
Highlight one of the three-fold-symmetric channels:
One 4-helix subunit from Desulfovibrio desulfuricans bacterioferritin, illustrating the coordination environment at the ferrioxidase site at which Fe(II) is converted to Fe(III)
One 4-helix subunit from bullfrog ferritin, indicating the ferroxidase site coordination.

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