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Protein insulin that made of two peptides that linked through S-S bond. After denaturation of insulin...

Protein insulin that made of two peptides that linked through S-S bond. After denaturation of insulin with urea and merkaptoethanol, only 3% of protein returned to its active form after disposal of urea and merkaptoethanol. Protein ribonucleas that has four S-S bonds After denaturation of insulin with urea and merkaptoethanol comes back to it's almost complete activity. Explain why.

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