By Justin Petrone

Growing demand for arrays designed to detect tumor copy-number changes is enticing more chip manufacturers to offer tools tailor-made for cancer research.

Ambry Genetics is the latest company to debut a cancer-screening service based on array comparative genomic hybridization. But competitive offerings loom on the horizon, with new products expected from Signature Genomics and Oxford Gene Technology, among others.

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Biologists turn to environmental DNA sampling to determine whether elusive or invasive species are shedding DNA in a given area.

Rob Knight writes at Scientific American that microbiome studies are about to break out of the laboratory.

Harold Varmus, the director of the National Cancer Institute, has announced that he is stepping down after nearly five years.

In Nature this week: omic analysis of permafrost microbes, hookworm genome, and more.