---
title: "One-letter code: research glossary | Sable Peptides"
description: "The one-letter code is a compact notation in which each standard amino acid is represented by a single capital letter, for example G for glycine, K for lys"
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---

Glossary

# One-letter code

The one-letter code is a compact notation in which each standard amino acid is represented by a single capital letter, for example G for glycine, K for lysine and W for tryptophan. It was introduced by Margaret Dayhoff and is standardised by IUPAC-IUBMB. Three-letter codes such as Gly, Lys and Trp are also used.

Source: [en.wikipedia.org](https://en.wikipedia.org/wiki/Amino_acid#Table_of_standard_amino_acid_abbreviations_and_properties)

## Related terms

-   [Amino acid](/glossary/amino-acid)
-   [Glycine](/glossary/glycine)
-   [Tryptophan](/glossary/tryptophan)
-   [Lysine](/glossary/lysine)

[Back to glossary A–Z](/glossary/terms)

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