Differentiate between cysteine and cystine. What is the role of cystine in maintaining protein structure?

Cysteine and cystine are both sulfur-containing amino acids, but they differ in their chemical structure and their role in protein biochemistry. 

Cysteine is a polar, sulfur-containing amino acid that has a thiol (-SH) group in its side chain. ______ ___ ______ ______ _________ ________ ____ _____.
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