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Fig. 3. Myoglobin consists of a backbone and heme-binding domain. (A) Myoglobin was
the first protein to be subjected to X-ray crystallography. The backbone of
myoglobin consists of eight 
-helices (blue) that wrap around a central
pocket containing a heme group (red), which is capable of binding various
ligands including oxygen, carbon monoxide and nitric oxide. (B) The protoheme
group is bracketed or stabilized by histidine residues above (His64) and below
(His93).
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