Hi, We are trying to develop a GC-RMA normalization plugin for GeneSpring, but we are running into a problem with missing probe sequence information for the HG_U95 chip sets. The probe_tab files that Affy is providing is missing the probe sequences for 172 probesets, since apparently, those sequences are only provided by TIGR and Affy never got the OK to redistribute those probe sequences...For the GC-RMA implementation, those probe sequences are required to correctly calculate the affinities for the probes and I was wondering if anyone has the probe sequences for those missing probesets... I looked at the probe sequences from the BioConductor site, but those also seem to be missing some of these probesequences... Has anyone collected those probe sequences for those 172 missing probes, or do I have to go to the TIGR site and retrieve them from there? Thanks, Thon de Boer Silicon Genetics