Tutorial for PSI-BLAST, an extension of BLAST that uses matrix algebra. BLAST is a cornerstone bioinformatics tool at NCBI. BLAST is the
Basic Local Alignment Search tool and will protein and DNA sequences that
are related to a sequence that the user provides.
How to download FASTA sequence for certain gene features while in the NCBI's Sequence Viewer.
Sequence Viewer homepage:
Sequence Viewer playlist: