... 
<fig id="f7" orientation="portrait" position="float">
 <label>FIG. 7.</label>
 <caption>
  <p>(2Si=O-H)<sup>+</sup> complex formation mechanism via three-fold 
   coordination of the O atom with subsequent H 1<italic>s</italic> level 
   lowering and extra electron donation to a DB in SiO<sub>2</sub> and to 
   the Si conduction band in the SiO<sub>2</sub>/Si interface, respectively.
   Electron excitation over to the SiO<sub>2</sub> conduction band denoted 
   by a symbol × is not allowed because the energy needed for excitation over 
   to SiO<sub>2</sub> conduction band is larger than the H 1<italic>s</italic> 
   level lowering.</p>
 </caption>
 <graphic orientation="portrait" position="float" xlink:href="f7"/>
</fig>
...

...
<p>All content in PubMed ultimately comes from publishers 
 of biomedical journals, and journals that are to be included
 in MEDLINE are subject to a selection process. The <ext-link
 xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri"
 xlink:href="http://www.nlm.nih.gov/pubs/factsheets/jsel.html">Fact 
 Sheet</ext-link> on <italic>Journal Selection for Index
 Medicus<sup>&reg;</sup>/MEDLINE<sup>&reg;</sup></italic>
 describes the journal selection policy, criteria, and procedures 
 for data submission.</p>
...

...
<p>The <italic>Escherichia coli argU</italic> gene encodes a minor arginine
 tRNA, tRNA<sup arrange="stack">Arg</sup><sub arrange="stack">UCU</sub>,
 which corresponds to the rare codon AGA and possibly AGG ...</p>
...