The Basic Local Alignment Search Tool (BLAST) finds regions of local similarity between sequences. The program compares nucleotide or protein sequences to sequence databases and calculates the statistical significance of matches. BLAST can be used to infer functional and evolutionary relationships between sequences as well as help identify members of gene families.
Configuration file tells GBrowse what glyphs to use to render each of the feature types. The format of these configuration files are described in GBrowse Documentation. See the GBrowse CONFIGURE_HOW_TO.txt file for details.