Researchers are still trying to come to grips with variations between microarray experiments that don’t reflect real biological differences. That’s why in its 2002 study, the Microarray Research Group (MARG) of the Association of Biomolecular Resource Facilities (ABRF) chose to get to the root of the problem, assessing possible factors contributing to variability in experiments that use Affymetrix arrays or cDNA spotted arrays.

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