World Intellectual Property Organization

 Administrative Instructions under the Patent Cooperation Treaty 

Annex C, Appendix 2

Nucleotide and Amino Acid Symbols and Feature Table

Table 3:  List of Amino Acids

Symbol
Meaning
Ala
Alanine
Cys Cysteine
Asp
Aspartic Acid
Glu
Glutamic Acid
Phe
Phenylalanine
Gly
Glycine
His
Histidine
Ile
Isoleucine
Lys
Lysine
Leu
Leucine
Met
Methionine
Asn
Asparagine
Pro
Proline
Gln
Glutamine
 Arg
 Arginine
 Ser
 Serine
 Thr
 Threonine
Val
 Valine
Trp
 Tryptophan
Tyr
 Tyrosine
Asx
 Asp or Asn
Glx
 Glu or Gln
Xaa
 unknown or other

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