Clinical Genomics Resource Incubator
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Clinical Genomics Resource Incubator, published by HL7 International / Clinical Genomics. This guide is not an authorized publication; it is the continuous build for version 0.1.0-ci-build built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/cg-incubator/ and changes regularly. See the Directory of published versions

CodeSystem: Amino Acid Symbols (Experimental)

Official URL: http://hl7.org/fhir/uv/cg-incubator/CodeSystem/amino-acid Version: 0.1.0-ci-build
Standards status: Informative Draft as of 2026-03-23 Maturity Level: 0 Computable Name: AminoAcid

Single-letter and three-letter symbols for amino acids based on IUPAC nomenclature, including unambiguous and ambiguous symbols.

This Code system is referenced in the definition of the following value sets:

Last updated: 2026-03-23 00:00:00+0000

Profile: Shareable CodeSystem

This case-sensitive code system http://hl7.org/fhir/uv/cg-incubator/CodeSystem/amino-acid defines the following codes:

CodeDisplayDefinition
A Alanine A
C Cysteine C
D Aspartic acid D
E Glutamic acid E
F Phenylalanine F
G Glycine G
H Histidine H
I Isoleucine I
K Lysine K
L Leucine L
M Methionine M
N Asparagine N
P Proline P
Q Glutamine Q
R Arginine R
S Serine S
T Threonine T
V Valine V
W Tryptophan W
Y Tyrosine Y
B Aspartic acid or asparagine D or N
U Selenocysteine U
X Unknown or other amino acid Any amino acid
Z Glutamic acid or glutamine E or Q
Ala Alanine Ala
Cys Cysteine Cys
Asp Aspartic acid Asp
Glu Glutamic acid Glu
Phe Phenylalanine Phe
Gly Glycine Gly
His Histidine His
Ile Isoleucine Ile
Lys Lysine Lys
Leu Leucine Leu
Met Methionine Met
Asn Asparagine Asn
Pro Proline Pro
Gln Glutamine Gln
Arg Arginine Arg
Ser Serine Ser
Thr Threonine Thr
Val Valine Val
Trp Tryptophan Trp
Tyr Tyrosine Tyr
Asx Aspartic acid or asparagine Asp or Asn
Sec Selenocysteine Sec
Xaa Unknown or other amino acid Any amino acid
Glx Glutamic acid or glutamine Glu or Gln

Description of the above table(s).