Hello,
   
  I have a set of rat affymetrix array. One of chip shows there is bright 'blue' corner in the 'sign.resids' image after applied 'affyPLM' package. How could I retrieve the affy ID corresponding the 'blue' area? Or, if I have a set of affy IDs, how could I get their physical location on the array? 
   
  Thanks a lot!
   
  Yanqin

 		
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