Figure 3. Graphical overview of BLAST results.

Figure 3Graphical overview of BLAST results

The query sequence is represented by the numbered red bar at the top of the figure. Database hits are shown aligned to the query, below the red bar. Of the aligned sequences, the most similar are shown closest to the query. In this case, there are three high-scoring database matches that align to most of the query sequence. The next twelve bars represent lower-scoring matches that align to two regions of the query, from about residues 3–60 and residues 220–500. The cross-hatched parts of the these bars indicate that the two regions of similarity are on the same protein, but that this intervening region does not match. The remaining bars show lower-scoring alignments. Mousing over the bars displays the definition line for that sequence to be shown in the window above the graphic.

From: Chapter 16, The BLAST Sequence Analysis Tool

Cover of The NCBI Handbook
The NCBI Handbook [Internet].
McEntyre J, Ostell J, editors.

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