Q: What base codes are not official IUB base codes?
A: The IUB (International Union of Biochemistry) created a definition of nucleotide representations. Any non-alphabetic or the letters E, F, I, J, L, O, P, Q, X, and Z are non-IUB base codes.The following are the official IUB base codes:
- Unambiguous bases:
A, C, G &T (or U)
- Either of two bases possible:
M (A or C)
R (A or G)
W (A or T/U)
S (C or G)
Y (C or T/U)
K (G or T/U)
- Any of three bases possible:
B (C, G or T/U)
D (A, G or T/U)
H (A, C or T/U)
V (A, C or G)
- Any of the four bases possible:
N (A, C, G or T/U)