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Taking arrays from the lab to the field: trying to make sense of the unknown.

With the rapid pace of nucleic acid microarray technology development and a renewed national emphasis on detecting and characterizing microorganisms in environmental samples, there is a rush to operationalize existing microarray technologies and apply them to uncharacterized environmental backgrounds. The purpose of this article is to pause and ask a basic question: what do microarray data actually mean in the face of uncharacterized sample backgrounds? In attempting to answer this question, we draw a clear distinction between hypothesis-driven fundamental science and operational uses of microarray technology; assess microarray technology assumptions in the face of uncharacterized environments; offer an environmental microbiologist's perspective on technology needs and requirements for quantitatively analyzing microbial communities; and hopefully stimulate a scientific and technical dialogue around the concept of analytical environmental microbiology and future technology development.