NCBI NOW, Lecture 7, Using BLAST for Genomic Analysis

Most investigators interested in next generation sequencing (NGS) are familiar with NCBI BLAST. Dr. Tom Madden will demonstrate tools for using BLAST to investigate NGS datasets, in either a web interface or the Linux command line.

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Hello. In the graphic summary of the Blast sometimes appear some separate regions joined by a horizontal black line and other times without this line. What does this mean? Thank you