X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=help%2Fhelp%2Fhtml%2FcolourSchemes%2Fnucleotideambiguity.html;h=c1ab5483411ce3b538478cce55192ba43e9eaf3a;hb=2a862754ef7069c5e9a99dc127af9b0b93c37d35;hp=b6660fb06fd49fd9e97ace89885b038fa2d09d5a;hpb=184fb2cb4f0420156e2601a7187b77b41406b52d;p=jalview.git

diff --git a/help/help/html/colourSchemes/nucleotideambiguity.html b/help/help/html/colourSchemes/nucleotideambiguity.html
index b6660fb..c1ab548 100755
--- a/help/help/html/colourSchemes/nucleotideambiguity.html
+++ b/help/help/html/colourSchemes/nucleotideambiguity.html
@@ -34,6 +34,14 @@ td {
   <p>
     <strong>Nucleotide Ambiguity Colours</strong>
   </p>
+  
+  
+  <p>
+  This colour scheme was devised by Suzanne Duce and the Jalview Team to highlight ambiguity codes used in nucleotide sequences.
+  </p>  
+  <p>
+  The use of X to represent an unknown base is acknowledged, but this is not recommended as the symbol refers to xanthine (see IUPAC-IUB Commission on Biochemical Nomenclature (CBN). <a href="https://iupac.qmul.ac.uk/misc/naabb.html">Abbreviations and Symbols for Nucleic Acids, Polynucleotides and their Constituents.</a>)
+  </p>
   <div align="center">
     <table width="200" border="1">
       <tr>
@@ -62,7 +70,7 @@ td {
       </tr>
       <tr>
         <td bgcolor="#4f6f6f">X</td>
-        <td>Xanthine (sometimes Unknown)</td>
+        <td>Unknown (sometimes Xanthine)</td>
       </tr>
       <tr>
         <td bgcolor="#CD5C5C">R</td>