Dear Bioconductor,

I have a question concerning a GEO data set. I have downloaded the data into
R using the GEOquery package. I'm trying to map the Affymetrix probe ids
onto gene symbols, but can't find the appropriate annotation data. Following
some of the tutorials, using the annotate package should help, but what I
get from the function annotation is the GEO platform identifier:

> library(GEOquery)
> library(annotation)
> data <- GEOquery(GEO='GSE13639')
> annotation(data)
[1] "GPL570"

I'd like to use functions like getSYMBOL, but I don't know which mapping
package to install.  Help will be much appreciated.

Yours,
Joern

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