Figure 6.

Frame-shifting deletion/insertion possibilities. The figure describes the frame-shifting deletion/insertion possibilities as well as which nucleotide query positions are kept, for the four deletion/insertion events. There are 4 possible ways of deleting a nucleotide amongst 4 nucleotides and 10 possible combinations of deleting two nucleotides amongst 5. There are 3 possible ways of inserting one and two nucleotides. However, given that the inserted nucleotide α ∈ {T,A,C,G}, there 10 non-overlapping triplets (4 + 3 + 3) for the single insert and 37 (42 + 4 x 3 + 32) for the double insert.

Lysholm BMC Bioinformatics 2012 13:230   doi:10.1186/1471-2105-13-230
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