Batch Entrez allows the user to download large predefined sets of sequences.
It used to be used to download all large sets of sequences (such as all the sequences from
an organism), but is now used only to retrieve all the sequences
from a prepared file of GI or accession numbers.
To get all the sequences from a file, click
on the "Browse" button, and find the file which contains the list of
GIs or Accession numbers that you want to retrieve. Also, make sure that you are
searching the correct type of database (nucleotide or protein). Then click on 'Retrieve'.
The query will return you to a page which looks like a normal query result
page as when you do a search from the regular Entrez page. From here, you can decide
what format you want your output
to take (i.e. GenBank,
FASTA, etc). and how you want to retrieve your sequences (to a file, clipboard or to
the browser window). With large sets of sequences, saving them to file is recommended.
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