This Week in PNAS

An international team led by investigators in France outlines efforts to sequence and characterize the genome of the red algal species Chondrus crispus, commonly called Irish moss — a member of a lineage descended from the first photosynthetic eukaryotes formed through endosymbiosis. After using Sanger sequencing to tackle a C. crispus sample grown from material collected in Peggy's Cove, Nova Scotia, in the 1980s, the researchers delved into the 105 million-base-pair genome sequence, identifying 9,600 or so predicted protein-coding genes.

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Researchers report that deleting one gene from butterflies affects their wing coloration patterns, according to the Washington Post.

The Seattle Times writes that pharmacogenomics testing can help choose medications that may work best for people with depression.

In PNAS this week: genome sequencing of weevil symbionts, retinoid X receptor deletion in lung cancer metastasis, and more.

Sequencing could help combat foodborne illnesses, according to a blog post by Food and Drug Administration officials.