There are various approaches that can be used.  If your organism is
represented among the org.* annotation
packages, as human is, you can use code like

> library(org.Hs.eg.db)
> get("AF414429", revmap(org.Hs.egACCNUM))
[1] "1"


On Sun, Jan 1, 2012 at 7:44 AM, Reema Singh <reema28sep@gmail.com> wrote:

> Hello All
>
> I am using GSE4137 for identifying differentaily gene expression analysis.
> For annotation i am using the platform annotation file provided by the
> vendor alongside their microarray platform. It has the GB_ACC number for
> each probe id. I want the corresponding entrez ids for each GB_ACC. My
> query is :-
>
> *How to convert GB_ACC number into Entrez id using R and Bioconductor ?*
>
>
> Regards~
>
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>
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