DK has the correct answer. Here's a list of Entrez databases and the fields on which they can be searched: http://dl.dropbox.com/u/1304874/entrez/index.html. You can get this information using the EInfo tool: http://eutils.ncbi.nlm.nih.gov/corehtml/query/static/einfo_help.html.
Ncbi Length Search
Hi,
Is it possible to specify the nucleotide length limit in a ncbi search ? I don't find anything on the NCBI website about this ?
Thanks,
N.
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You can specify various options in the Entrez Query field to search against subset of the database. Here is a description of the field: http://www.ncbi.nlm.nih.gov/BLAST/blastcgihelp.shtml#entrez_query
For example to limit search against entries that are between 500 to 1000 base pairs/residues you would type into the Entrez Query field: 500:1000[slen]
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Is this for a nucleotide similarity search? Or for a search for an entry in a nucleotide database?