This Week in Science

In Science this week, a team led by researchers at the University of Toronto report on the discovery that cancers with identical genomes can sometimes act differently, including how they respond to treatment. Using DNA copy number alteration profiling, sequencing, and lentiviral lineage tracking, the investigators followed the repopulation dynamics of 150 single lentiviral-marked lineages from 10 human colorectal cancers through serial xenograft passages in mice.

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The president of France's National Research Agency has resigned, according to Nature News.

A senator wants a "right-to-try" provision in the US Food and Drug Administration funding bill, but an ethicist says at Stat News that it would undermine the role of clinical trials.

In PNAS this week: red algae Porphyra umbicalis genome, deep neural network model for sequencing peptides, and more.

The Guardian's Barbara Ellen has tried out some DNA testing services to see whether they provide valuable information.