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Affymetrix GeneChip® Rat Genome 230 2.0 Array
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Why didn't Affymetrix use the final assembly of the rat genome for this design?
When the original Rat Expression 230 Set was designed, a draft assembly of the rat genome was used to improve the design through more robust cDNA sequence orientation calling and trimming of low-quality regions of EST sequences. The current assembly (v3.1) is still in a draft state and a redesign using this newer assembly would result in a minimal improvement in content.