[BioC] Affy ST 1.0 gene chip background probes cut off set up

[Stacy_Xu at bd.com]

   Hi, guys
   There are several ways to do the background corrections for the new ST 1.0
   chip from Affy from bio-conductor like xps, affy-aroma,pdfInfo and rma. And
   almost all of those have a parameter to indicate background correction or
   subtraction.  According  to  Affy  data  sheet for human ST 1.0 array,
   "Background  is  estimated using a set of approximately 17,000 generic
   background probes. Standard poly-A controls and hybridization controls are
   represented on the arrays to allow convenient troubleshooting along the
   entire experimental process."
   I am wondering are the information or IDs of those 17,000 background RNA
   probes somewhere in the CEL file where I can set up my negative cut off
   expression level? They do have some "antigenomic" controls, but there are
   only about 60 of those and they are not what we want.
   Thanks,
   Stacy
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