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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Dog DNA testing finds that some purebreds might not truly be purebreds, Inside Edition reports.

Mary Beckerle has returned as director of the Huntsman Cancer Institute, according to ScienceInsider.

Smithsonian Magazine reports that environmental DNA sampling can be used to track elusive organisms.

In Genome Research this week: repetitive satellite DNA in the fruit fly, transcriptome map assembly pipeline, and more.