The correct answer is NOT keratin... the correct answer is myoglobin. This is the oxygen-binding pigment in muscle.
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The amino-acid secquence of myoglobin is the primary
structure.
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When myoglobin is reduced by nitric oxide through the curing
process.
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in myoglobin, the molecules are compacted but in haemoglobin,
the molecule formed by 4 subunits which are identical in pairs. its
4 times larger than myoglobin.