37 CFR Part 1, Appendix C
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Source: World Intellectual Property Organization (WIPO) Handbook on Industrial Property Information and Documentation, Standard ST.25: Standard for the Presentation of Nucleotide and Amino Acid Sequence Listings in Patent Applications (2009).
| 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. |
[86 FR 57052, Oct. 14, 2021]