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- Basic Local Alignment Search Tool - BLAST
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
- Nucleotide BLAST: Search nucleotide databases using a nucleotide query
Important update Effective August 2025, the ClusteredNR database will become the default Protein BLAST database Learn more about ClusteredNR
- Nucleotide BLAST: Search nucleotide databases using a nucleotide query
This title appears on all BLAST results and saved searches Enter one or more queries in the top text box and one or more subject sequences in the lower text box Then use the BLAST button at the bottom of the page to align your sequences
- BLAST: Basic Local Alignment Search Tool - National Center for . . .
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: Basic Local Alignment Search Tool
Effective August 2025, the ClusteredNR database will become the default Protein BLAST database Learn more about ClusteredNR
- BLAST QuickStart - Comparative Genomics - NCBI Bookshelf
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: Basic Local Alignment Search Tool
Click on a column header below to sort by that column clicking the 'Saved Search Strategy' link at the top of a BLAST report Saved Strategies saves all of your search parameters It saves query sequences only if they are expressed as accessions or as FASTA files less than 10,000 characters long It does not save formatting parameters
- Welcome to BLAST Help — BLASTHelp documentation
Welcome to BLAST Help ¶ Getting started ¶ Web BLAST quick start guide New BLAST databases New Guide to BLAST home and search pages Blast report description Blast topics Frequently Asked Questions Getting Help ¶ Write to the help desk Mailing list BLAST tutorials About BLAST ¶ NCBI Handbook The Statistics of Sequence Similarity Scores BLAST
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