The majority of the HG-U133 Plus 2.0 Array consensus sequences are well covered in the new design with approximately 75% of them containing over 8 probes on the Exon Array. The remaining 25% have less overlap with the new exon probes, and are mostly attributed to EST-based HG-U133 Array probe sets that do not contain an annotated coding region. As a result, in many such cases, the entire HG-U133 Array EST-based consensus sequence is designated as one PSR, with around 4 probes selected for that entire region.
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