The default layout of the NCBI BLAST result is a graphical representation of the hits found, a table of sequence identifiers of the hits together with scoring information, and alignments of the query sequence and the hits. This graphical output (shown in figure 13.21) gives a quick overview of the query sequence and the resulting hit sequences. The hits are colored according to the obtained alignment scores.
Figure 13.21: BLAST graphical view. A simple graphical overview of the hits found aligned to the query sequence. The alignments are color coded ranging from black to red as indicated in the color label at the top.
The table view (shown in figure 13.22) provides more detailed information on each hit and furthermore acts as a hyperlink to the corresponding sequence in GenBank.
In the alignment view (figure 13.23), one can manually inspect the individual alignments generated by the BLAST algorithm. This is particularly useful for detailed inspection of the sequence hit found(sbjct) and the corresponding alignment. In the alignment view, all scores are described for each alignment, and the start and stop positions for the query and hit sequence are listed. The strand and orientation for query sequence and hits are also found here.
In most cases, the table view of the results will be easier to interpret than tens of sequence alignments.