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Illumina's gene expression product line addresses researchers' requirements for high-
  performance arrays. Illumina arrays interrogate multiple whole genomes or focused sets of target genes across large sample populations with low cost per sample. Illumina is the only company that performs quality control on every single feature on every array.
 
full-length 50-mer probes provide better selectivity and sensitivity
high feature density enables low sample and reagent volumes
feature redundancy (30X average) delivers high-confidence results
100% feature-to-feature QC
multi-sample array formats
DASL™ assay (paraffin-embedded samples)
  Alternatively, explore Illumina's DASL assay for profiling biomarkers in partially degraded RNAs like those found in formalin-fixed, paraffin-embedded (FFPE) samples. The DASL assay utilizes Sentrix Universal Arrays and allows you to monitor between 512 and 1536 genes in parallel in archival samples.
low per-sample pricing allows bigger experimental scale