Question
What is quaternary structure of proteins?
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$\text{CH}_3-\text{CH}-\text{CH}_2\text{OH}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$
$\text{C}_6\text{H}_5-\text{O}-\text{C}_2\text{H}_5$
