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The DNA nucleotide codes describe the four base compounds that make up a DNA sequence. The codes are as follows.

Name Letter Type Pairs With Formula
adenine a purine guanine C5H5N5
guanine g purine adenine C5H5N5O
cytosine c pyrimidine thymine C4H5N3O
thymine t pyrimidine cytosine C5H6N2O2

The SproutDatabase mostly manipulates fully-realized DNA sequences for complete genomes, which means only the four letters shown above will appear in our DNA sequences; however, when doing a pattern scan, you can also specify the StandardAmbiguityCodes. These are wild cards that indicate multiple possible nucleotide values, as shown in the table below. You can also use the code u to indicate uracil (C4H4N2O2), the compound that replaces thymine when RNA is created.

Code Nucleotides
M {A, C}
R {A, G}
W {A, T}
S {C, G}
Y {C, T}
K {G, T}
V {A, C, G}
H {A, C, T}
D {A, G, T}
B {C, G, T}
N {A, C, G, T}
SequencingForm
Sequence 000100
Summary Definitions of the four DNA nucleotides
Topic revision: r2 - 11 Oct 2008 - 23:47:08 - BruceParrello
 
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