or cannot operate.</p>
<p><strong>The PDB Viewer Window</strong>
<p>This interactive structure viewing window is opened by selecting
-the <strong>"Sequence→View PDB entry:"</strong> entry in
-the <a href="../menus/popupMenu.html">sequence id pop-up menu</a>. This
-can only be done for sequences which have an <a href="viewingpdbs.html">associated
+entries from the <strong>"Structure→"</strong> submenu
+ of the <a href="../menus/popupMenu.html">sequence
+ id pop-up menu</a>. The internal PDB viewer is not able to show
+ superpositions, so no other options are provided. Structures can only
+ be viewed for sequences which have an <a href="viewingpdbs.html">associated
PDB structure</a>, and the PDB Viewer will only be associated with the
particular alignment view from which it was opened.</p>
<p><strong>Controls</strong></p>