[[Entrez]] is a retrieval system for searching several linked [[Database]]s in [[NCBI]]. Index-based [[Database]] search.

http://www.ncbi.nlm.nih.gov/Entrez/

[[EUtils]]라는 프로그래밍 API를 제공한다. 

== 사용예제 ==
소(''Bos tarus'')의 임신관련 [[Gene]]
{{{
(cow[orgn] OR txid9913[orgn]) AND (pregnancy OR birth OR uterine OR placenta OR  placental)
}}}

== BiologicalDatabase 종합 ==

 * Nucleotide : [[dbEST]],[[dbGSS]],[[dbSNP]],[[dbSTS]], GenBank, HomoloGene, [[MGC]],PopSet, RefSeq, TPA, UniGene, [[UniSTS]]
 * Protein : Domains, RefSeq, PROW
 * Structure : Domains, MMDB, 3D Domains
 * [[Taxonomy]]
 * [[Genome]], Expression : [[GEO]], [[SAGE]]

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CategoryDatabase