The quadruplex sequence of a genome looks like this Gx Ny1 Gx Ny2 Gx Ny3 Gx, where G is the Guanine base and the Ns are representing other bases. The x, y1, y2 and y3 are integer. A particular segment will be quadruplex sequence if x>=2. My question is I want to count how many such segments are present in a FASTA sequence and what are their types in terms of x, y1,y2 and y3. For that purpose I need some help from your side.
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