The three-dimensional structures ofmyoglobin
and of the hemoglobin $ and ! chains are very
similar, although their amino acid sequences
correspond in only 24 of 141 positions. The !
chain, with 146 amino acids, is somewhat
longer than the $ chain, with 141 amino acids.
The structural similarity is functionally significant:
The oxygen-binding region lies inside the
molecule, where it is protected, and oxygen uptake
from the aqueous surroundings is reversible.
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