Hello,

I have some microarray data from a few years ago, and the rs identifier in the file was from dbSNP 131. In order to do some analysis on this old data, I will need to know the positions of the microarray SNPs, and thus would like to download dbSNP131.

However, on [UCSC Table Browser][1], I can no long find this database. I tried: assembly: hg19, group: Variations - then there is no dbSNP131 under tracks.

Does anyone know any other places to access dbSNP131 please? Or, is it save to just use dbSNP 138? The microarray chip was HumanOmni2.5-8v1 from Illumina.

Thank you

 [1]: http://genome.ucsc.edu/cgi-bin/hgTables
Okay after some digging, I found that you can downloading all old version of dbSNP databases from [ANNOVAR][1].

Command:

    annotate_variation.pl -buildver hg19 -downdb -webfrom annovar snp131 humandb/

The format is exactly the same with the dbSNP table from UCSC: https://genome.ucsc.edu/cgi-bin/hgTables

 [1]: http://annovar.openbioinformatics.org/en/latest/