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The genetic code used for translation of the input sequence is selected from the dropdown menu. Should other genetic code be used, a user can modify one of the selectable genetic codes by first selecting particular genetic code from the menu and then changing the selection to "User Provided". The genetic code table can be completely replaced, but the format must stay exactly the same. One can find and copy-paste genetic codes from the Genetic Codes NCBI webpage.


The sequence is:
linear circular
Restriction sites:
pre-set list of most commonly used enzymes (edit the list)
all commercially available enzymes (see the list)
exclude 4-cutters
exclude 5-cutters
exclude enzymes with degenerated recognition motifs
Dam/Dcm-methylated sites:
hide display
Genetic code: (display)
Save Fasta

Plain text, fasta or GenBank formats.

Plain text is just text without any formatting (i.e. from e.g. Notepad, but not MS Word). A fasta file is plain text sequence with a header in the form ">sequence name". A GenBank file contains a nucleotide sequence plus related information and feature definitions.


Sequence Name:
Translate & Analyze
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Selection: - 0 bp %GC
Clear All
Apply & Process
Undo Changes
All fields will be erased, unsaved work will be lost!
Restriction Site:
Clear Search
Find Rev Compl


To display the cutting pattern and positions, doubleclick the enzyme name.


To display the cutting pattern and positions, doubleclick the enzyme name. To apply changes made in the selection, press 'Enter' key or click the 'Apply' button.


  • Basic worflow:
    1. Paste a DNA sequence in the editor field or open a sequence file.
    2. Modify settings as needed.
    3. Select the coding part of the sequence.
    4. Click the Translate & Analyze button.
    5. Inspect results in the restriction sites table and in the graphical output. Move mouse pointer over the restriction site names for additional information.
  • Executing silent mutagenesis:
    1. Doubleclick the restriction enzyme name in the tabular results.
    2. Click the position of interest among the cyan-marked ranges.
    3. Click the Apply & Process button.
    4. The sequence now contains the new restriction site and is ready for further silent mutagenesis or to be saved in a file.
  • If any manual editing is done in the editor field, click the Apply & Process button before performing translation and analysis.


genetic code


Symbol Bases represented Complement
R A, G Y
Y C, T R
K G, T M
M A, C K
S C, G S
W A, T W
B C, G, T V
D A, G, T H
H A, C, T D
V A, C, G B
N A, C, G, T N


Overhang Enzymes
N│G A T C N N C T A G│N BamHI, BglII
N│A A T T N N T T A A│N EcoRI, MfeI (MunI)
N│T C G A N N A G C T│N SalI, XhoI
N│C T A G N N G A T C│N AvrII (XmaJI), NheI, SpeI (BcuI), XbaI
N T G C A│N N│A C G T N NsiI (Mph1103I), PstI
N│G T A C N N C A T G│N Acc65I (Asp718I), BsiWI (Pfl23II), BsrGI (Bsp1407I)
N│C C G G N N G G C C│N AgeI (BshTI), BspEI (Kpn2I), XmaI (Cfr9I)
N│G G C C N N C C G G│N EagI (Eco52I), PspOMI (Bsp120I), NotI
N│C G C G N N G C G C│N AscI (SgsI), BssHII (PauI), MluI
N N│C G N N N N G C│N N AclI (Psp1406I), BstBI (Bsp119I), ClaI (Bsu15I), NarI
N N│T A N N N N A T│N N AseI (VspI), NdeI
N N A T│N N N N│T A N N PacI, PvuI
blunt ends AfeI (Eco47III), BsaBI (BseJI), DraI, EcoRV (Eco32I), Ecl136II, FspI (NsbI), HpaI (KspAI), MscI (MlsI), NaeI (PdiI), NruI (Bsp68I), PmeI (MssI), PmlI (Eco72I), PvuII, ScaI, SfoI (EheI), SmaI, SnaBI (Eco105I), SrfI, SspI, StuI (Eco147I), SwaI (SmiI), XmnI (PdmI), ZraI

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DISCLAIMER: This free software comes without any warranty. The author of the software bears no responsibility for any loss or damage that may arise from its use for gene design or any other purpose.

Silent Mutator is, provides or allows to:

Silent mutagenesis online tool

Silent mutation scanning tool

Introduce restriction sites without changing amino acid sequence

Introduce restriction sites without changing protein sequence