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Frequently asked questions

Our Scientific Applications Support team has assembled a list of frequently asked questions to help you find answers quickly. Filter using one or more categories to focus on specific topics, or use the search bar to perform a text search.

What are the base degeneracy codes that you use (e.g. R, W, K, V, S)?

The one letter codes for degenerate bases are determined by the International Union of Biochemistry (IUB), based on base properties.

For example, the letter Y is the symbol for unspecified pyrimidine nucleoside and the letter R is for unspecified purine nucleoside.

The letters used for ordering degenerate bases are as follows: R = A,G ; Y = C,T; M = A,C ; K = G,T; S =C,G; W = A,T; H = A,C,T ; B = C,G,T ; V = A,C,G ; D = A,G,T; N = A,C,G,T

Degenerte Nucleotide Codes
R =  A,G 
Y = C,T 
M = A,C 
K = G,T 
S = C, G
W = A,T 
H = A,C,T 
B =  C,G,T 
V =  A,C,G 
D =  A,G,T 
N =  A,C,G,T 

Want more information? Explore IDT's Mixed Bases Product Page

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