Used to mark text that should remain in roman script no matter what style the surrounding text takes on.
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Any combination of:
<addr-line>, <aff>, <alt-title>, <anonymous>, <article-title>, <attrib>, <award-id>, <bold>, <chapter-title>, <chem-struct>, <collab>, <comment>, <copyright-statement>, <corresp>, <def-head>, <degrees>, <disp-formula>, <edition>, <etal>, <ext-link>, <fax>, <funding-source>, <funding-statement>, <given-names>, <inline-formula>, <inline-supplementary-material>, <institution>, <issue>, <issue-part>, <issue-sponsor>, <issue-title>, <italic>, <journal-subtitle>, <journal-title>, <kwd>, <label>, <license-p>, <mixed-citation>, <monospace>, <named-content>, <on-behalf-of>, <overline>, <p>, <part-title>, <phone>, <prefix>, <preformat>, <price>, <product>, <publisher-loc>, <publisher-name>, <related-article>, <role>, <roman>, <sans-serif>, <sc>, <series>, <series-text>, <series-title>, <sig-block>, <source>, <speaker>, <strike>, <string-name>, <styled-content>, <sub>, <subject>, <subtitle>, <suffix>, <sup>, <supplement>, <surname>, <target>, <td>, <term>, <term-head>, <textual-form>, <th>, <title>, <trans-source>, <trans-subtitle>, <trans-title>, <underline>, <verse-line>, <volume>, <xref>
... <sec> <title>Seasonal Variations of <roman>CO</roman>, <roman>N<sub>2</sub>O</roman>, and <roman>CO<sub>2</sub></roman></title> <p>Recent evidence supports the premise that concentrations of major greenhouse gases vary ...</p> ... </sec> ...
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<p>... members of each group were asked to respond to several
statements involving their emotional well-being and denoting
anxiety and/or depression. Responses were limited to a 5-point
scale (1 = <italic>completely disagree <roman>to 5 =</roman>
completely agree</italic>) and were used subsequently to analyze
the efficacy of the trial medication in comparison with sertaline
and placebos.</p>
...
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