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object --+ | Alphabet --+ | SingleLetterAlphabet --+ | ProteinAlphabet --+ | ExtendedIUPACProtein
Extended uppercase IUPAC protein single letter alphabet including X etc.
In addition to the standard 20 single letter protein codes, this includes:
B = "Asx"; Aspartic acid (R) or Asparagine (N) X = "Xxx"; Unknown or 'other' amino acid Z = "Glx"; Glutamic acid (E) or Glutamine (Q) J = "Xle"; Leucine (L) or Isoleucine (I), used in mass-spec (NMR) U = "Sec"; Selenocysteine O = "Pyl"; Pyrrolysine
This alphabet is not intended to be used with X for Selenocysteine (an ad-hoc standard prior to the IUPAC adoption of U instead).
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