NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.
SNP FAQ Archive [Internet]. Bethesda (MD): National Center for Biotechnology Information (US); 2005-.
This publication is provided for historical reference only and the information may be out of date.
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?
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—not so any more.
- Discrepancies between dbSNP Summary Data and FTP Data - SNP FAQ ArchiveDiscrepancies between dbSNP Summary Data and FTP Data - SNP FAQ Archive
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