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Amino Acid Abbreviations: 1-Letter and 3-Letter Codes

Amino Acid Abbreviations: 1-Letter and 3-Letter Codes

Last updated: February 11, 2026

This table shows the correspondence between 1-letter and 3-letter amino acid abbreviations, as well as their English and Japanese names. You can sort the columns in ascending order by clicking the ▼ icon.

1-letter
3-letter
English Name
Japanese Name
AAlaAlanineアラニン
CCysCysteineシステイン
DAspAspartic Acidアスパラギン酸
EGluGlutamic Acidグルタミン酸
FPhePhenylalanineフェニルアラニン
GGlyGlycineグリシン
HHisHistidineヒスチジン
IIleIsoleucineイソロイシン
KLysLysineリシン
LLeuLeucineロイシン
MMetMethionineメチオニン
NAsnAsparagineアスパラギン
PProProlineプロリン
QGlnGlutamineグルタミン
RArgArginineアルギニン
SSerSerineセリン
TThrThreonineトレオニン
VValValineバリン
WTrpTryptophanトリプトファン
YTyrTyrosineチロシン

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