Figure 2.

BLAST retrieval accuracy. The 3586 astral40 sequences having at least one other relative in the astral40 data set (18,19) are used as queries in a search of this database. The results are pooled and sorted by E-value, and ROC curves are produced by plotting the number of true positives against the number of false positives as one descends the retrieval list. In (A), ROC curves are shown for B-BLAST, S-BLAST, SU-BLAST, C-BLAST and CU-BLAST. The ROC₅₀₀₀ scores for these programs are also shown, each having a standard error of ± 0.0002 (2). In (B), the same ROC curves are shown in a semi-log plot, using the scales of coverage and errors per query (30).