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Standard Nucleotide BLAST BLASTN programs search nucleotide databases using a nucleotide query. more...
Nov 28, 2023 · 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.
The Nucleotide database is a collection of sequences from several sources, including GenBank, RefSeq, TPA and PDB. Genome, gene and transcript sequence data provide the foundation for biomedical research and discovery.
The Basic Local Alignment Search Tool (BLAST) finds regions of local similarity between protein or nucleotide sequences. The program compares nucleotide or protein sequences to sequence in a database and calculates the statistical significance of the matches.
BLAST. > blast-help. > Frequently Asked Questions ¶. Q: What are the lower case, grey letters in the query sequence in BLAST results? You are seeing the result of automatic filtering of your query for low-complexity sequence. This filter prevents matches that are probably artifacts.
For example, choose "nucleotide blast" to search a nucleotide database using a nucleotide query. Descriptions of the search types appear to the right of the links. See BLAST Forms below for a description of key features of these forms. Specialized BLAST contains links to special-purpose BLAST databases and tools such as trace archives and IgBLAST.
There are many options on the Standard Nucleotide BLAST page. For example, you can select different databases to search; you can exclude certain data sources; and you can select a specific algorithm by which to search.
