Set of seven server-side programs that provide a stable interface to the search, retrieval, and linking functions of the Entrez system, using a fixed URL syntax.\\
The output provided by the E-Utilities is in XML format\\
"Entrez Direct (EDirect) is an advanced method for accessing the NCBI's set of interconnected databases (publication, sequence, structure, gene, variation, expression, etc.) from a UNIX terminal window. Functions take search terms from command-line arguments. Individual operations are combined to build multi-step queries. Record retrieval and formatting normally complete the process."
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\subsection{EInfo}
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Provides a {\bf list of the names of all valid Entrez databases}.\\
Provides statistics for a single database, including lists of indexing fields and available link names.
<Description>Taxonomy records associated with the current articles through taxonomic information on related molecular database records (Nucleotide, Protein, Gene, SNP, Structu
re).</Description>
<DbTo>taxonomy</DbTo>
</Link>
<Link>
<Name>pubmed_unigene</Name>
<Menu>UniGene Links</Menu>
<Description>UniGene clusters of expressed sequences that are associated with the current articles through references on the clustered sequence records and related Gene record
s.</Description>
<DbTo>unigene</DbTo>
</Link>
<Link>
<Name>pubmed_unists</Name>
<Menu>UniSTS Links</Menu>
<Description>Genetic, physical, and sequence mapping reagents in the UniSTS database associated with the current articles through references on sequence tagged site (STS) subm
issions as well as automated searching of PubMed abstracts and full-text PubMed Central articles for marker names.</Description>
<DbTo>unists</DbTo>
</Link>
</LinkList>
</DbInfo>
</eInfoResult>
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\subsection{GQuery}
Provides the number of records retrieved in all Entrez databases by a single text query.