Code A C G T U M R W S Y K V H D B N
Adenine Cytosine Guanine Thymine Uracil
A or C (amino) A or G (purine) A or T (weak) C or G (strong) C or T (pyrimidine) G or T (keto) A or C or G A or C or T A or G or T C or G or T
A or G or C or T (any)
Nucleic Acid(s)
Table 2. Standard IUB/IUPAC amino acid codes
One-letter code A B C D E F G H I K L M N P Q R S T V W X Y Z
Alanine
Aspartic acid or Asparagine Cysteine Aspartic acid Glutamic acid Phenylalanine Glycine Histidine Isoleucine Lysine Leucine Methionine Asparagine Proline Glutamine Arginine Serine Threonine Valine Tryptophan Unknown Tyrosine
Glutamic acid or Glutamine
Amino acid
Three-letter code Ala Asx Cys Asp Glu Phe Gly His Ile Lys Leu Met Asn Pro Gln Arg Ser Thr Val Trp Xxx Tyr Glx
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