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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This publication is provided for historical reference only and the information may be out of date.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This publication is provided for historical reference only and the information may be out of date.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="#__NBK573558_dtls__">Show details</a><div style="display:none" class="ui-widget" id="__NBK573558_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>; 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/FTP_Parsing_dbSNP/" title="Previous page in this title">&lt; Prev</a><a class="active page_link next" href="/books/n/helpsnpfaq/FTP_Discrp_Clstr_FTP/" 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="_NBK573558_"><span class="title" itemprop="name">Discrepancies between dbSNP Summary Data and FTP Data</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"><div><h4 id="FTP_Discrp_dbSNP_FTP.the_summary_page_of">The summary page of a particular build implies that there are7,231,721 rs numbers. I interpret your FTP files to have 7,238,948, a difference of 7227. Can you resolve this difference?</h4><blockquote><p>There are about 7,200 redundant rs numbers in the FTP file, because SNPs in the pseudo-autosomal region (PAR) are reproduced in both the X and Y chromosome files. The introduction of PAR into the NCBI assembly is fairly recent. The rs set in our FTP files used to be unique&#x02014;not so any more.</p></blockquote></div><div id="bk_toc_contnr"></div></div></div>
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