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+<head>
+<title>Nucleic Acid Support</title>
+<style type="text/css">
+<!--
+td {
+ font-family: "Courier New", Courier, mono;
+ font-style: normal;
+ font-size: medium;
+}
+-->
+</style>
+</head>
+<body>
+ <p>
+ <strong>Nucleic Acid Support</strong>
+ </p>
+ <p>
+ <em>Colour Schemes</em>
+ </p>
+ <p>Jalview has color schemes for nucleic acid based sequences,
+ ability to fetch sequences from RFAM and RNA secondary structure
+ coloring</p>
+ <p>
+ Information on the <a href="../colourSchemes/nucleotide.html">Nucleotide
+ colour scheme</a> and <a href="../colourSchemes/purinepyrimidine.html">
+ Purine/Pyrimidine colour scheme</a> are available under the Colour
+ Menu. See <a href="../colourSchemes/index.html">Colour Schemes</a>.
+ </p>
+ <p>
+ <em>RNA Support</em>
+ </p>
+ Jalview supports annotation of RNA sequences with secondary structure
+ information. You can interactively
+ <a href="../features/annotation.html#rna">create and edit RNA
+ secondary structure annotation rows</a>, or import data in the following
+ way:
+ <ul>
+ <li><em>RFAM</em> - Sequences can be <a
+ href="../features/seqfetch.html">fetched</a> from the RFAM
+ database by accession number or ID.</li>
+ <li><em>Stockholm files</em> - WUSS (or VIENNA) dot-bracket
+ notation found in the secondary structure annotation line will be
+ imported as sequence or alignment associated secondary structure
+ annotation.</li>
+ <li><em>Clustal files</em> - certain RNA alignment programs,
+ such as <a href="http://rna.informatik.uni-freiburg.de/LocARNA">LocaRNA</a>
+ output consensus RNA secondary structure lines in the line
+ normally reserved for the Clustal consensus line in a clustal
+ file.</li>
+ <li><em>RNAML</em> Jalview can import RNAML files containing
+ sequences and extended secondary structure annotation derived from
+ RNA 3D structure</li>
+ </ul>
+ <p>
+ <strong>RNA Secondary Structure Visualization and Analysis</strong><br />
+ If a sequence or RNA alignment has secondary structure information,
+ the alignment will have a secondary structure line shown below it,
+ and a number of additional options become available:
+ <ul>
+ <li><a href="../colourSchemes/rnahelicesColouring.html">RNA
+ Helix colouring</a> - highlights columns of alignment involved in
+ particular RNA helices, Uses the first displayed secondary
+ structure annotation.</li>
+ <li><a href="../calculations/structureconsensus.html">Base
+ Pair Conservation Analysis</a> - shown as a histogram and base-pair
+ logo below the alignment. Uses the first displayed secondary
+ structure annotation row.</li>
+ <li><a href="../features/varna.html">2D Structure
+ Visualization in VARNA</a> - allows linked viewing of the consensus
+ or an individual sequence's structure. Accessed via the Sequence
+ ID popup menu.</li>
+ <li><strong>per sequence secondary structure
+ annotation</strong><br /> Sequence associated secondary structure
+ annotation imported via stockholm, PDB files, or other sources can
+ be shown on the alignment with the <strong>Colours→By
+ Annotation</strong> dialog box. Colours are assigned according to RNA
+ helix topology number (number of distinct nested helices).
+ Alignments can also be sorted by RNA helix secondary structure
+ topology number, <em>via</em> the <strong>Calculations→Sort→By
+ Annotation→Secondary Structure</strong> option (only present when
+ per-sequence secondary structure is available).</li>
+ </ul>
+ <p>
+ <strong>Pseudo-knots</strong><br /> Jalview 2.8.2 introduced
+ limited support for working with structures including pseudoknots.
+ Where possible, extended WUSS symbols (e.g. different types of
+ parentheses, or upper and lower case letters) are preserved when
+ parsing RNA structure annotation and will be shaded differently when
+ displayed in the structure.<br /> Extended WUSS annotation is also
+ employed to distinguish different base pair interactions obtained
+ from RNAML files.
+ </p>
+
+ <p>
+ <strong>Limitations when working with RNA in Jalview</strong><br />
+ Currently, Jalview is not able to export RNA secondary structure
+ annotation in any format other than Jalview annotation </br> <em>Jalview's
+ RNA handling capabilities were introduced in v2.8</em>
+ </p>
+ <p align="center"> </p>
+</body>
+</html>