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                <title level="j">Amino Acids</title>
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                  <date type="datePub">2012-09</date>
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                <term xml:lang="en">folds</term>
                <term xml:lang="en">cis peptides</term>
                <term xml:lang="en">omega dihedral</term>
                <term xml:lang="en">cis-trans isomerization</term>
                <term xml:lang="en">structural alignment</term>
                <term xml:lang="en">structural alphabet</term>
                <term xml:lang="en">Protein Blocks</term>
                <term xml:lang="en">Protein Data Bank</term>
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