Dear Sir or Madam, Kindly help me out with thir regard; I am interested to remove the outliers from my ProbesetID list. How to find out the outliers among transcripts(genes)?. Outliers among Chips could be easily made out but my worry is among transcripts(If there are any out of @48000 in HumanChip). Thanking you in advance antony -- John Antonydas Gaspar, Phd Student AG: Prof.A.Sachinidis Institute of Neurophysiology University of Cologne Robert-Koch-Str. 39 50931 Cologne/Germany Tel: 004922125918042 Handy: 004917683142627