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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>SNP FAQ Archive [Internet]. Bethesda (MD): National Center for Biotechnology Information (US); 2005-. </p></div><div class="messagearea bk_noprnt" style="margin-bottom:1.3846em "><ul class="messages"><li class="warn icon"><span class="icon">This publication is provided for historical reference only and the information may be out of date.</span></li></ul></div><div class="bk_prnt"><p style="color:red;"><strong>This publication is provided for historical reference only and the information may be out of date.</strong></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/helpsnpfaq/"><img class="source-thumb" src="/corehtml/pmc/pmcgifs/bookshelf/thumbs/th-helpsnpfaq-lrg.png" alt="Cover of SNP FAQ Archive" height="100px" width="80px" /></a><div class="icnblk_cntnt eight_col"><h2>SNP FAQ Archive [Internet].</h2><a data-jig="ncbitoggler" href="#__NBK3861_dtls__">Show details</a><div style="display:none" class="ui-widget" id="__NBK3861_dtls__"><div>Bethesda (MD): <a href="https://www.ncbi.nlm.nih.gov/" ref="pagearea=page-banner&targetsite=external&targetcat=link&targettype=publisher">National Center for Biotechnology Information (US)</a>; 2005-.</div></div><div class="half_rhythm"><ul class="inline_list"><li style="margin-right:1em"><a class="bk_cntns" href="/books/n/helpsnpfaq/">Contents</a></li></ul></div></div><div class="icnblk_cntnt two_col"><div class="pagination bk_noprnt"><a class="active page_link prev" href="/books/n/helpsnpfaq/Rprt_Error_Messages_/" title="Previous page in this title">< Prev</a><a class="active page_link next" href="/books/n/helpsnpfaq/Bld_Triggers_New_Bld/" title="Next page in this title">Next ></a></div></div></div></div></div>
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<div class="main-content lit-style" itemscope="itemscope" itemtype="http://schema.org/CreativeWork"><div class="meta-content fm-sec"><h1 id="_NBK3861_"><span class="title" itemprop="name">The dbSNP Build Process</span></h1><p class="small">Created: <span itemprop="datePublished">July 7, 2005</span>; Last Update: <span itemprop="dateModified">February 18, 2014</span>.</p></div><div class="body-content whole_rhythm" itemprop="text"><p>This section contains FAQs that provide general information about how a new dbSNP build is triggered, how builds are scheduled, the difference between a dbSNP build and a genome build, the data changes that can occur between builds, as well as FAQs that will show you how to find old build data, or the date of an old build. There are FAQs in this section that describe sequence notation and explain strand orientation, and describe portions of the mapping process in detail. There are also FAQs in this section that can help you find missing or merged SNPs, tell you why a SNP merged or split, answer questions about submitted data or explain how dbSNP computes data – from determining ancestral alleles to calculating a double hit SNP.</p><p>
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<b>To begin searching this section of the dbSNP FAQ Archive, you can:</b>
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</p><p><b>Click on</b> any of the “dbSNP Build Process” <b>sub-categories listed</b> in the “Contents” section <b>below</b> to navigate to the sub-category of your choice. Once you are in the sub-category, you will be presented with a grey box containing the questions for the sub-category you selected. Clicking on a question in this list will allow you to navigate to the answer.</p><h2 id="_NBK3861_Bld_Triggers_New_Bld">Contents</h2><ul class="simple-list"><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_Triggers_New_Bld/">What Triggers a New Build?</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_SNP_Build_Sched/">The SNP Build Schedule/Notification of Build Release</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_Data_Chng_Btwn/">Data Changes that Occur Between Builds</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_LagTim_dbSNP_FTP/">Lag Time between dbSNP Website and FTP Site Following Build</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_Diff_SNP_Genome/">The Difference Between the SNP Build and the Genome Build</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_Old_vs_New_Data/">Using Old vs. New Build Data</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_Find_Old_Build/">Finding Old Build Data</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_Find_Build_Numb/">Finding a Build Number Based on a Date and Vice Versa</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_dbSNP_Mapping/">The dbSNP Mapping Process</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_Mg_RefSNP_RefSNP/">Merging RefSNP Numbers and RefSNP Clusters</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_Ancest_Allele/">Ancestral Allele Data</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_Avg_Allele_Freq/">Average Allele Frequency Calculation</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_Double_Hit_SNP/">Double Hit SNP Computation</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_HardyWeinberg_Eq/">Hardy Weinberg Equilibrium Data</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_Heterozygosity/">Heterozygosity Data</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_Linkage_Disequil/">Linkage Disequilibrium Data</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_dbSNP_HaplotpDat/">dbSNP Haplotype Data</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_dbSNP_Haplogroup/">dbSNP and Haplogroup Data</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_dbSNP_HaplotpSnp/">dbSNP and Haplotype Tagged SNPs</a></li><li class="half_rhythm"><a class="toc-item" href="/books/n/helpsnpfaq/Bld_dbSNP_HapMap/">dbSNP and HapMap Data</a></li></ul><div id="bk_toc_contnr"></div></div></div>
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<p class="address_footer text-white">National Library of Medicine<br />
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<a href="https://www.google.com/maps/place/8600+Rockville+Pike,+Bethesda,+MD+20894/@38.9959508,-77.101021,17z/data=!3m1!4b1!4m5!3m4!1s0x89b7c95e25765ddb:0x19156f88b27635b8!8m2!3d38.9959508!4d-77.0988323" class="text-white" target="_blank" rel="noopener noreferrer">8600 Rockville Pike<br />
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Bethesda, MD 20894</a></p>
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<p><a href="https://www.nlm.nih.gov/web_policies.html" class="text-white">Web Policies</a><br />
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<a href="https://www.nih.gov/institutes-nih/nih-office-director/office-communications-public-liaison/freedom-information-act-office" class="text-white">FOIA</a><br />
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<a href="https://www.hhs.gov/vulnerability-disclosure-policy/index.html" class="text-white" id="vdp">HHS Vulnerability Disclosure</a></p>
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||
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<div class="col-lg-3 col-12 centered-lg">
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<p><a class="supportLink text-white" href="https://support.nlm.nih.gov/">Help</a><br />
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<a href="https://www.nlm.nih.gov/accessibility.html" class="text-white">Accessibility</a><br />
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<a href="https://www.nlm.nih.gov/careers/careers.html" class="text-white">Careers</a></p>
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<div class="row">
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<div class="col-lg-12 centered-lg">
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<a class="text-white" href="//www.nlm.nih.gov/">NLM</a>
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||
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<li>
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||
<a class="text-white" href="https://www.nih.gov/">NIH</a>
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<li>
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||
<a class="text-white" href="https://www.hhs.gov/">HHS</a>
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<li>
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<a class="text-white" href="https://www.usa.gov/">USA.gov</a>
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