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, highlighting the ferrioxidase site at which Fe(II) is converted to Fe(III)

Detailed view of a three-fold channel, believed to to be the point at which iron ions enter the shell. The green spheres are magnesium ions, thought to model possible iron ion binding / transport sites, supported by glutamate and aspartate residues lining the channel.

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