Figure 6
From: Optimal neighborhood indexing for protein similarity search
Sensitivity/selectivity trade-off using different alphabets with a constant neighborhood length. Sensitivity/selectivity trade-off for two neighborhoods of length 11 (other lengths give similar results). When the length is fixed, reduced alphabets provide worse results than the Σ20 × Σ20 alphabet. The curves for alphabets Σ20 × Σ4 and Σ20 × Σ2, not shown, are even worse.