This publication is provided for historical reference only and the information may be out of date.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.
Publication Details
Publication History
Created: July 7, 2005; Last Update: February 18, 2014.
Copyright
Publisher
National Center for Biotechnology Information (US), Bethesda (MD)
NLM Citation
SNP FAQ Archive [Internet]. Bethesda (MD): National Center for Biotechnology Information (US); 2005-. Discrepancies between dbSNP Summary Data and FTP Data. 2005 Jul 7 [Updated 2014 Feb 18].