Educational biology content — not medical advice.

Tools · calculator

Amino Acid Lookup

Verified standard amino-acid names, codes, classifications, and codons.

Instructions

Browse or search the 20 standard amino acids.

Sequences are limited to 20000 characters after cleaning. Shareable URLs encode at most 400 characters.

Interactive tool

1-letter3-letterNameClassCodons
A Ala Alanine Nonpolar GCU, GCC, GCA, GCG
R Arg Arginine Basic CGU, CGC, CGA, CGG, AGA, AGG
N Asn Asparagine Polar AAU, AAC
D Asp Aspartic acid Acidic GAU, GAC
C Cys Cysteine Polar UGU, UGC
Q Gln Glutamine Polar CAA, CAG
E Glu Glutamic acid Acidic GAA, GAG
G Gly Glycine Nonpolar GGU, GGC, GGA, GGG
H His Histidine Basic CAU, CAC
I Ile Isoleucine Nonpolar AUU, AUC, AUA
L Leu Leucine Nonpolar UUA, UUG, CUU, CUC, CUA, CUG
K Lys Lysine Basic AAA, AAG
M Met Methionine Nonpolar AUG
F Phe Phenylalanine Nonpolar UUU, UUC
P Pro Proline Nonpolar CCU, CCC, CCA, CCG
S Ser Serine Polar UCU, UCC, UCA, UCG, AGU, AGC
T Thr Threonine Polar ACU, ACC, ACA, ACG
W Trp Tryptophan Nonpolar UGG
Y Tyr Tyrosine Polar UAU, UAC
V Val Valine Nonpolar GUU, GUC, GUA, GUG

Example

Try the built-in example button in the tool panel, or use classroom sequences such as ATGGAGTTTTAA for DNA tools and Aa × Aa for Punnett squares.

How to interpret results

Results are deterministic educational calculations based on standard molecular biology and Mendelian rules. Read warnings and assumptions printed with each result. These tools do not provide clinical, diagnostic, or research-grade sequence interpretation.

Biological background

Verified standard amino-acid names, codes, classifications, and codons. Connect the outputs to the related learning topics below for packaging, expression, or inheritance context.

Limitations

  • Deterministic classroom models only — not AI guesses and not clinical advice.
  • Ambiguous IUPAC bases, alternative genetic codes, linkage, and epigenetic effects are out of scope unless a tool explicitly states otherwise.
  • Sequence length and request size are limited to protect the server.
  • Huge sequences are not placed into shareable URLs.

Related learning topics

  • Translation — Translation is ribosomal synthesis of a polypeptide directed by mRNA codons.
  • Codon — A codon is a three-nucleotide mRNA sequence that specifies an amino acid or a translation stop signal.

Related tools

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Source / methodology note

Calculators use verified deterministic rules (Watson–Crick base pairing, the standard genetic code, Mendelian Punnett logic, and Hardy–Weinberg algebra). Explorers use Chromatin.net’s educational content model. See methodology.