The National Center for Biotechnology Information (NCBI) maintains a number of sequence databases that can be accessed over the Internet. MacVector has a built-in Internet database browser that lets you search the NCBI's Entrez databases for sequences using combinations of search terms such as author, organism, keywords, accession number etc.
Sequences that match the search terms can be downloaded either individually or in batches to your desktop or to a folder on your hard drive. Sequences are retrieved with all of their associated annotations and features intact. These can be viewed and edited in MacVector, or used for additional analyses.
The Basic Local Alignment Search Tool (BLAST) algorithm is a popular program for identifying sequences in a databases that share sequence similarity to a search sequence. MacVector provides an integrated Internet BLAST interface to the databases at the NCBI. You can search using any of the blastn, blastp, tblastn, blastx and tblastx algorithms using any sequence databases available at the NCBI. The BLAST searches take place in the background, so you can continue to work with MacVector while one or more searches are in progress. As well as providing a standard BLAST report of the best aligning sequences in the database, MacVector also lets you select sequence in the "hitlist" and directly download those to your desktop or hard drive for further analysis.