Illumina, Inc. offers two Sentrix BeadChips that enable whole-genome and RefSeq-based expression profiling of multiple samples on the same microarray. The new expression offerings, which have undergone extensive testing at customer locations, provide sensitivity, throughput and ease of use for gene discovery, pathway research and molecular characterization of disease. The Sentrix Human-6 BeadChip analyzes six discrete human RNA samples on one chip, interrogating in each sample over 46,000 transcripts from the human genome. The Human-6 BeadChip contains over 10 million features. A companion product, the Sentrix HumanRef-8 BeadChip, can query eight samples in parallel against 23,000 transcripts derived from genes represented in the consensus RefSeq database, a well-characterized whole-genome subset used broadly in genetic analysis.