Probes mapping to genome sequences. The percentage corresponds to probes from the given array mapped at least once to the corresponding genome. On average about 94% of probes map the human genome, ~84% the mouse genome, ~87% the rat genome, and ~88% other genomes.
Ballester et al. BMC Genomics 2010 11:294 doi:10.1186/1471-2164-11-294