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23 <title>The VARNA RNA Viewer</title>
27 <strong>The VARNA RNA Viewer</strong>
30 <a href="http://varna.lri.fr">VARNA</a> was integrated into Jalview
31 2.8 to allow interactive viewing of RNA secondary structure
32 annotation. It is opened by selecting the <strong>"Structure→View
33 Structure:"</strong> option in the <a href="../menus/popupMenu.html">sequence
34 id pop-up menu</a> (if you can't see this, then no RNA structure is
35 associated with your sequence or alignment). In the pop-up menu all
36 structures that are associated with this sequence and all sequences
37 that are associated with the alignment are available.
39 Saving a Jalview session as a project file includes the state of any
40 Varna viewers, which are reopened when the project is reloaded <em>(since
43 <strong>Different structures</strong>
46 <li><b>Alignment structures</b>: Structures associated with the
47 alignment are marked by having "consensus" attached to
48 their name. VARNA contains two different entries for consensus
51 <li>Consensus structure: the individual sequence folded
52 into the consensus structure</li>
53 <li>Trimmed consensus structure: the individual sequence
54 folded into the the gap-free consensus structure. That means
55 all columns that contained gaps in the individual sequence
56 were removed. If this breaks a base-pair the pairing is
57 removed also. This can be considered as an approximation for
58 the individual structure.
60 <li><b>Individual structures</b>: this is a structure
61 associated with the individual sequence and therefore not related
65 <strong>Controls</strong><br>
67 <li>Rotate view - Left Click and drag</li>
68 <li>Zoom in - Press '+'</li>
69 <li>Zoom out - Press '-'</li>
70 <li>Choose a different structure - Left click on structure in
71 the left hand panel</li>
72 <li>Highlighting bases - Move mouse over columns in the Jalview
77 <strong>Functionality provided by VARNA</strong>
79 <p>VARNA's own functions are accessed by right-clicking in the
80 structure display area. That will open the VARNA pop-up menu, which
81 provides access to a number of features like different draw
82 algorithm, color highlighting or annotations.</p>
84 <strong>More Information</strong>
87 VARNA is a very powerful RNA viewer on its own. Only the essentials
88 have been described here - the interested reader is referred to <a
89 href="http://varna.lri.fr/index.php?page=manual&css=varna">VARNA's
90 own comprehensive online documentation</a>.