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<div class="pre-content"><div><div class="bk_prnt"><p class="small">NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.</p><p>LinkOut Help [Internet]. Bethesda (MD): National Center for Biotechnology Information (US); 2006-. </p></div><div class="iconblock clearfix whole_rhythm no_top_margin bk_noprnt"><a class="img_link icnblk_img" title="Table of Contents Page" href="/books/n/helplinkout/"><img class="source-thumb" src="/corehtml/pmc/pmcgifs/bookshelf/thumbs/th-helplinkout-lrg.png" alt="Cover of LinkOut Help" height="100px" width="80px" /></a><div class="icnblk_cntnt eight_col"><h2>LinkOut Help [Internet].</h2><a data-jig="ncbitoggler" href="#__NBK3810_dtls__">Show details</a><div style="display:none" class="ui-widget" id="__NBK3810_dtls__"><div>Bethesda (MD): <a href="https://www.ncbi.nlm.nih.gov/" ref="pagearea=page-banner&amp;targetsite=external&amp;targetcat=link&amp;targettype=publisher">National Center for Biotechnology Information (US)</a>; 2006-.</div></div><div class="half_rhythm"><ul class="inline_list"><li style="margin-right:1em"><a class="bk_cntns" href="/books/n/helplinkout/">Contents</a></li></ul></div><div class="bk_noprnt"><form method="get" action="/books/n/helplinkout/" id="bk_srch"><div class="bk_search"><label for="bk_term" class="offscreen_noflow">Search term</label><input type="text" title="Search this book" id="bk_term" name="term" value="" data-jig="ncbiclearbutton" /> <input type="submit" class="jig-ncbibutton" value="Search this book" submit="false" style="padding: 0.1em 0.4em;" /></div></form></div></div><div class="icnblk_cntnt two_col"><div class="pagination bk_noprnt"><a class="active page_link prev" href="/books/n/helplinkout/Public/" title="Previous page in this title">&lt; Prev</a><a class="active page_link next" href="/books/n/helplinkout/lib/" title="Next page in this title">Next &gt;</a></div></div></div></div></div>
<div class="main-content lit-style" itemscope="itemscope" itemtype="http://schema.org/CreativeWork"><div class="meta-content fm-sec"><h1 id="_NBK3810_"><span class="title" itemprop="name">Using LinkOut</span></h1><p class="small">Created: <span itemprop="datePublished">July 25, 2005</span>; Last Update: <span itemprop="dateModified">January 11, 2023</span>.</p><p><em>Estimated reading time: 3 minutes</em></p></div><div class="jig-ncbiinpagenav body-content whole_rhythm" data-jigconfig="allHeadingLevels: ['h2'],smoothScroll: false" itemprop="text"><p>LinkOut provides access to a wide range of relevant online resources, directly from NCBI databases. This section provides information on using LinkOut to locate and access these resources.</p><div id="using.Viewing_LinkOut_Resources_in_NCBI"><h2 id="_using_Viewing_LinkOut_Resources_in_NCBI_">Viewing LinkOut Resources in NCBI Database Records: The LinkOut display</h2><p>You can see links that have been assigned to an NCBI database record in the LinkOut display.</p><p>Note: When you click on LinkOut icons or links in the LinkOut display, you are directed to the resource at an external site. Please review use and copyright information on the resource provider&#x02019;s site before using or distributing their material.</p><p>In PubMed the LinkOut full text and supplemental information displays only in the Abstract single citation format. The links are found under "LinkOut - more resources." In PubMed, you can also <a href="#using.Viewing_Links_as_Icons_in_PubMed">view full text links as icons</a>.</p><p>
<div class="graphic"><img src="/books/NBK3810/bin/using-Image001.jpg" alt="Image using-Image001.jpg" /></div>
</p><p>
<div class="graphic"><img src="/books/NBK3810/bin/using-Image002.jpg" alt="Image using-Image002.jpg" /></div>
</p><p>LinkOut information may also appear within NCBI database records. For example, you can see the External Information Resources section in the Taxonomy database records. The appearance of links within NCBI database records varies according to the database that you are using.</p><p>
<div class="graphic"><img src="/books/NBK3810/bin/using-Image003.jpg" alt="Image using-Image003.jpg" /></div>
</p><p>Available resources will vary depending on which links have been assigned to the specific database record. A Gene database example of links to Chemical, Medical and Molecular biology resources.</p><p>
<div class="graphic"><img src="/books/NBK3810/bin/using-Image004.jpg" alt="Image using-Image004.jpg" /></div>
</p></div><div id="using.Viewing_Links_as_Icons_in_PubMed"><h2 id="_using_Viewing_Links_as_Icons_in_PubMed_">Viewing Links as Icons in PubMed</h2><p>You can view links as icons in PubMed&#x02019;s Abstract display. The icons are supplied by LinkOut providers - external organizations that have submitted linking information for their web-accessible resources. The <a href="https://www.ncbi.nlm.nih.gov/projects/linkout/journals/htmllists.cgi?type_id=6" ref="pagearea=body&amp;targetsite=external&amp;targetcat=link&amp;targettype=uri">list of LinkOut providers </a>includes publishers, research institutes, and a variety of commercial and non-profit organizations.</p><p>Three types of icons appear in PubMed by default - icons that link to the full text at the journal publisher&#x02019;s site, icons that link to the full text at PubMed Central, and icons that link to other free full text resources such as institutional repositories. Full text articles at a publisher&#x02019;s site may require a subscription to view.</p><p>The image below displays a single PubMed citation with two default icons: an icon that links to the full text article at the publisher&#x02019;s site and an icon that links to the free article full text at PubMed Central.</p><p>
<div class="graphic"><img src="/books/NBK3810/bin/using-Image005.jpg" alt="Image using-Image005.jpg" /></div>
</p></div><div id="using.Locating_NCBI_Database_Records_wit"><h2 id="_using_Locating_NCBI_Database_Records_wit_">Locating NCBI Database Records with Links to a Specific Resource</h2><p>There are two ways locate database records with links to a specific resource. My NCBI can <a href="#using.Using_Filters_to_Display_NCBI_Data">display the records as a filter</a> in the search result, or you can limit an individual search to records with links to a specific resource.</p><div id="using.Using_Filters_to_Display_NCBI_Data"><h3>Using Filters to Display NCBI Database Records with Links to Specific Resources</h3><p>My NCBI includes a filter feature that groups search results by areas of interest. Filters are available for the following NCBI databases, PubMed, Nucleotide, Protein and Taxonomy.</p><p>To display database records as a filter in the search result:</p><dl class="temp-labeled-list"><dt>1.</dt><dd><p class="no_top_margin">Sign in to <a href="https://www.ncbi.nlm.nih.gov/books/NBK3842/#MyNCBI.Signing_into_My_NCBI" ref="pagearea=body&amp;targetsite=external&amp;targetcat=link&amp;targettype=uri">My NCBI</a></p></dd><dt>2.</dt><dd><p class="no_top_margin">Select the database where you want to create a filter and click the link <span class="bk_pgobj">Manage Filters</span></p></dd></dl><p><span class="bk_pgobj">Browse Filters</span> by selecting any of the four categories available: Popular, LinkOut, Properties or Links. You may also <span class="bk_pgobj">Search for Filters</span> by selecting the LinkOut, Properties or Links radio button and entering the provider name in the search box.</p><p>3. After finding the provider that you would like to display as a filter, check the box under the <span class="bk_pgobj">Filter</span> column. To display the provider&#x02019;s icon in PubMed, check the box under <span class="bk_pgobj">Link Icon</span>. You can select up to five filters for each database in My NCBI, except for PubMed where 15 filters are allowed.</p><p>The providers that you selected will be displayed as filters under &#x0201c;Filter your results&#x0201d; as long as you are signed in to My NCBI. To learn more about using filters in My NCBI, see <a href="https://www.ncbi.nlm.nih.gov/books/NBK53591/#workingwithfilters.Setting_Up_Filters" ref="pagearea=body&amp;targetsite=external&amp;targetcat=link&amp;targettype=uri">My NCBI Help</a>.</p></div><div id="using.Limiting_a_Search_to_Records_with"><h3>Limiting a Search to Records with Links to a Specific Resource</h3><p>To limit a single search to records with links to a specific resource, enter the following in the search box:</p><blockquote><p><b>loprov<i>NameAbbr</i> [filter]</b>
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