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Cell division rates dwindle as people age, researchers led by Johns Hopkins University School of Medicine's Bert Vogelstein report in the Proceedings of the National Academy of Sciences this week. They collected tissue samples from the colon, duodenum, esophagus, and sinuses of 13 people between the ages of 20 and 29 and of 13 people between the ages of 80 and 89.

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Rady Children's Institute for Genomic Medicine and Deloitte are looking into the use of drones to transport samples for testing. 

Direct-to-consumer genetic testing firm 23andMe is laying off about 100 people.

Researchers from Northwestern University examined dust for antibiotic-resistance genes, New Scientist reports. 

In Science this week: researchers present a computational method for predicting cellular differentiation state from single-cell RNA sequencing data, and more.