Hi Greg,

Chromosome coordinates are 0-based only *inside* UCSC database tables. 
Everything that is exposed to the user (e.g. via the web interface) is 
1-based.

Cheers,
Ivan

On Thursday 09 December 2010 03:53:11 pm Gregory Dougherty wrote:
> My understanding of UCSC Genome browser location numbers is they're 0-based
> start, 1-based end.  However, when I look up an rsID, I get something like
> this:
>
> dbSNP: rs10000001
> Position: chr4:112583767-112583767
>
> That can't be half-open, since the SNP is of size 1, but end - beginning =
> 0.
>
> So, are rsID positions 1 based, or 0 based?
>
> Thanks,
>
> Greg



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