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In addition to the 4 nucleotide letters, there are letters that mean "the letter is one of these two or three: M = aMine = A or C R = puRine = A or G W = Weak (two hydrogen bonds) = A or T S = Strong (three hydrogen bonds) C or G Y = pYrimadine = C or T K = Ketone = G or T B = not A D = not C H = not G U = not T I would guess the the lowercase ...

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