Mouse Genome 430 2.0 Array The GeneChip Mouse Genome 430 2.0 Array provides comprehensive coverage of the mouse genome on a single microarray. The new Mouse Genome 430 2.0 Array includes all of the content from the previous generation GeneChip Mouse Expression 430 Set (A and B arrays) and represents over 45,000 probe sets including over 34,000 well-substantiated mouse genes. Sequences used in the design of the array were selected from GenBank, dbEST, and RefSeq. The sequence clusters were created from the UniGene database (Build 107, June 2002) and then refined by analysis and comparison with the publicly available draft assembly of the mouse genome from the Whitehead Institute for Genome Research (MGSC, April 2002). Mouse Genome 430A 2.0 Array The GeneChip Mouse Genome 430A 2.0 Array is a single array representing over 22,600 transcripts including over 14,000 well- substantiated mouse genes that can be used to explore biology and disease processes. Sequences used in the design of the array were selected from GenBank, dbEST, and RefSeq. The sequence clusters were created from the UniGene database (Build 107, Jun 2002) and then refined by analysis and comparison with the publicly available draft assembly of the mouse genome from the Whitehead Institute for Genome Research (MGSC, April 2002). Mouse Expression Set 430 This two-array set of GeneChip probe arrays represents over 45,000 probe sets including over 34,000 well-substantiated mouse genes. Sequences used in the design of the array were selected from GenBank, dbEST, and RefSeq. The sequence clusters were created from the UniGene database Build 107 (June 2002) and then refined by analysis and comparison with the publicly avail- able draft assembly of the mouse genome from the Whitehead Institute Center for Genome Research (MGSC, April 2003). The Mouse 430A Array includes representation of the RefSeq database sequences and probe sets related to sequences previously represented on the Murine Genome U74Av2 Array. The Mouse 430B Array contains well-characterized mouse genes as well as probe sets representing refined EST clusters.