+
+IUPAC Nucleotide Code
+~~~~~~~~~~~~~~~~~~~~~
+
+For your convience, below is a table of the IUPAC Nucleotide Code.
+
+The following table is table 1 from "Nomenclature for Incompletely
+Specified Bases in Nucleic Acid Sequences" which can be found at
+http://www.chem.qmul.ac.uk/iubmb/misc/naseq.html.
+
+====== ================= ===================================
+Symbol Meaning Origin of designation
+====== ================= ===================================
+G G Guanine
+A A Adenine
+T T Thymine
+C C Cytosine
+R G or A puRine
+Y T or C pYrimidine
+M A or C aMino
+K G or T Keto
+S G or C Strong interaction (3 H bonds)
+W A or T Weak interaction (2 H bonds)
+H A or C or T not-G, H follows G in the alphabet
+B G or T or C not-A, B follows A
+V G or C or A not-T (not-U), V follows U
+D G or A or T not-C, D follows C
+N G or A or T or C aNy
+====== ================= ===================================
+
+