There's no denying the popularity of DNA microarrays: 1.8 billion data points in the Stanford Microarray Database don't lie. But a lack of standards and quality control metrics for everything from RNA preparation to probe design to data analysis has led to the perception, at least, that gene expression profile concordance between, and even within labs is, shall we say, spotty.
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In Search of Microarray Standards
An industry/academia/government coalition puts microarray reproducibility to the test
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