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SlideshowReport

The geometry of iron coordination in oxymyoglobin

Description
The octahedral coordination of the iron ion. The iron and the four nitrogens from protoporphyrin IX lie nearly in a plane.

A histidine (F8, or His 93) occupies one of the axial positions, and O2 the other.

Schematic drawing of the heme pocket, showing the proximal (F8; His93) and distal (E7; His64) histidine side chains.
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