Summary of sequence-oriented probe matching. (a) 10,212 Affymetrix Porcine short oligonucleotides map to Porcine Glass long oligonucleotides. They cluster into 5,452 probe clusters around each long oligonucleotide sequence. (b) 727 Affymetrix Human short oligonucleotides map to Porcine Glass long oligonucleotides, clustering into 520 probe clusters. (c) The intersection of these two mappings results in 333 probe clusters which are used to assess intra-platform reproducibility. 82 of these probe clusters contain short oligonucleotide sequences that match exactly between the two Affymetrix platforms.