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Affymetrix GeneChip® Rat Genome 230 2.0 Array
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Why were the default gamma values changed for Rat 230 2.0 Array?
The gamma parameters default for this array was set to deliver specificity consistent with our other expression products. (The changes in the default gamma values apply to 11- micron arrays.) These parameters are user definable. The Technical Note "Fine Tuning Your Data Analysis" available on our web site www.affymetrix.com/support/technical/technotesmain.affx describes how changing the gamma values will allow the user to tune the balance between specificity and sensitivity.