Figure 1

The distribution of sibling probe set numbers per gene in Affymetrix Human and Mouse chips. The figure describes the distribution of the probe set numbers per gene on the Affymetrix mouse moe4302 chip and human hgu133Plus2. About 40% of genes are presented by multiple probe sets, half of which are represented by three or more sibling probe sets, and some genes have even more than ten sibling probe sets.