Which nucleotides are considered “specifically defined” according to WIPO Standard ST.26?

According to MPEP 2412.03(a), WIPO Standard ST.26 defines “specifically defined” nucleotides as any nucleotide other than those represented by the symbol “n”. The MPEP provides a table of nucleotide symbols, where: Symbols a, c, g, and t/u represent specifically defined nucleotides Symbols like m, r, w, s, y, k, v, h, d, and b represent…

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