This Week in PLOS

In PLOS One, researchers from the National Oceanic and Atmospheric Administration and the University of Washington report on killer whale diet clues detected using DNA-based analyses of the animals' poop samples. The team pooled 175 fecal samples collected over the summers from 2006 to 2011 into 13 groups, which were compared with two control samples with known DNA compositions as well as sequence databases containing information for 19 fish that may fall prey to killer whales.

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Microsoft co-founder Paul Allen also contributed to brain research, NPR reports.

The New York Times reports on the shifting interpretations of what some genetic variants mean over time.

MIT's Technology Review reports on Genentech's pursuit of personalized cancer vaccines.

In Cell this week: investigation of metastatic tumor evolution, more than 16,000 genetic variants introduced into the budding yeast model organism, and more.