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The protein portion of each of these chains is called "globin". The and b globin chains are very similar in structure. In this case, a and b refer to the two types of globin.
Figure 2 is a close up view of one of the heme groups of the human a chain from dexoyhemoglobin. In this view, the iron is coordinated by a histidine side chain from amino acid 87 (shown in green.)
Each a or b globin chain folds into 8 a helical segments (A-H) which, in turn, fold to form globular tertiary structures that look roughly like sub-microscopic kidney beans. The folded helices form a pocket that holds the working part of each chain, the heme...
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