The table of IUPAC ambiguous nucleic acid notation

iupac.rb

iupac = {
  "A" => ["A"], # Adenine
  "C" => ["C"], # Cytosine
  "G" => ["G"], # Guanine
  "T" => ["T"], # Thymine
  "R" => ["A", "G"], # puRine
  "Y" => ["C", "T"], # pYrimidine
  "S" => ["G", "C"], # Strong
  "W" => ["A", "T"], # Weak
  "K" => ["G", "T"], # Keto
  "M" => ["A", "C"], # aMino
  "D" => ["A", "G", "T"], # after C
  "B" => ["G", "T", "C"], # after A
  "H" => ["A", "T", "C"], # after G
  "V" => ["A", "G", "C"], # after T and U
  "N" => ["A", "C", "G", "T"], # aNy
}