Dear, 

>From the raw probe level data, we would like to select only those of the
central SNP probe (position 0, with the SNP position exactly in the middle)
from the sense as well as from the antisense strand.  How can we do this?

We know we can get the GC content from that central probe based on the
'Mapping250K_Nsp snp info.txt' file.  How can we get %GC for each of the
other probes as well? Is there a cdf for the Nsp and Sty arrays? Or can we
get this info out of the pd.mapping250k.nsp/pd.mapping250k.sty? Or is there
another way to get that info?

Thanks in advance for your help! 

Regards, 
An 


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