May 16 webinar: Improved Standalone BLAST database and programs: now with taxonomic information


Next Wednesday, May 16, 2018, we’ll show you how to download and use the latest standalone BLAST databases, dbv5. You’ll learn how to use BLASTdbv5 and the new BLAST programs to limit searches to taxonomic groups and to retrieve sequences from the database by taxonomy.

Date and time: Wed, May 16, 2018 12:00 PM – 12:30 PM EDT

Register here: https://bit.ly/2qW7LLy

After registering, you will receive a confirmation email with information about attending the webinar. A few days after the live presentation, you can view the recording on the NCBI YouTube channel. You can learn about future webinars on the Webinars and Courses page.

BLAST+ database improved


We’ve made some recent enhancements to the BLAST+ applications that allow you to:

  1. Limit your search by taxonomy using information built into the BLAST databases
  2. Search sequences by accession faster
  3. Use blastdbcmd to retrieve sequences by taxonomy from a BLAST database

The new version of the BLAST databases (version 5, release notes) supports the items listed above. You can access the new executables on FTP. Sample version 5 databases are also available.

Note: This is an alpha release to allow users to test and comment on new features.

Problems/Feedback

Please send problem reports and feedback to blast-help@ncbi.nlm.nih.gov or write to the Help Desk.

New taxonomy files available with lineage, type, and host information


NCBI is now producing a new set of taxonomy files that include the taxonomic lineage of taxa, information on type strains and material, and host information. These files are particularly helpful for people maintaining local installations of NCBI data.

You can download the new archive (new_taxdump.tar.gz) from the taxonomy directory on the FTP site (ftp.ncbi.nlm.nih.gov/pub/taxonomy/new_taxdump/). The new files are typematerial.dmp, typeoftype.dmp, rankedlineage.dmp, fullnamelineage.dmp,
taxidlineage.dmp, and host.dmp. Please see the readme file for details of the file contents.

The original taxonomy file archive without the new content will remain available under its original name, taxdump.tar.gz. The section below shows the entries for the monkey species Cercopithecus lomamiensis from the new ranked lineage and  type material files. Continue reading