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download ncbi nucleotide database
use LWP::Simple;$query = 'chimpanzee[orgn]+AND+biomol+mrna[prop]';#assemble the esearch URL$base = 'https://eutils.ncbi.nlm.nih.gov/entrez/eutils/';$url = $base . "esearch.fcgi?db=nucleotide&term=$query&usehistory=y";#post the esearch URL$output = get($url);#parse WebEnv, QueryKey and Count (# records retrieved)$web = $1 if ($output =~ /<WebEnv>(\S+)<\/WebEnv>/);$key = $1 if ($output =~ /<QueryKey>(\d+)<\/QueryKey>/);$count = $1 if ($output =~ /<Count>(\d+)<\/Count>/);#open output file for writingopen(OUT, ">chimp.fna") || die "Can't open file!\n";#retrieve data in batches of 500$retmax = 500;for ($retstart = 0; $retstart < $count; $retstart += $retmax) { $efetch_url = $base ."efetch.fcgi?db=nucleotide&WebEnv=$web"; $efetch_url .= "&query_key=$key&retstart=$retstart"; $efetch_url .= "&retmax=$retmax&rettype=fasta&retmode=text"; $efetch_out = get($efetch_url); print OUT "$efetch_out";}close OUT;
Source: www.ncbi.nlm.nih.gov
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