Hi, I am using a custom Affymetrix array which contains GC bins. I would like to implement a probe-level analysis using the GC bin probes. How do I access the GC probes? Lana Schaffer Biostatistics/Informatics The Scripps Research Institute DNA Array Core Facility La Jolla, CA 92037 (858) 784-2263 (858) 784-2994 schaffer at scripps.edu