The 2.1M Deluxe Promoter is a single array design containing expanded promoter regions for all known and alternative transcript start sites. The 3x720K RefSeq Promoter is a multiplex slide with 3 identical arrays per slide enabling the simultaneous analysis of 3 ChIP samples for increased sample throughput. The 385K - Two Array Set contains all annotated splice variants and alternative transcription start sites. 385K RefSeq Promoters are single array designs containing all known well-characterized RefSeq genes. 385K RefSeq XM Promoters are single array designs containing model reference sequences produced by NCBI's Genome Annotation Project (those accessions beginning with XM) that are predicted by genome sequence analysis.

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