This Week in Science

In this week's Science, scientists from the Salk Institute describe how mouse pups that receive less maternal care have more transposons in a certain part of the brain, suggesting that early life experience can influence somatic variation in the genome. In the study, the investigators focused on long interspersed nuclear element–1 (L1) retrotransposons, and found that pups receiving less maternal care exhibited noticeably more transposon replication in the hippocampus.

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Researchers find that historical factors influence which genes are the most highly studied, the Atlantic reports.

The US National Science Foundation's new sexual harassment policy is to go into effect next month, according to Nature News.

Researchers report using genotyping to tie together illegal ivory shipments and trace them back to a handful of cartels, the New York Times reports.

In Nature this week: genomic ancestry analysis of Sardinians, current noncoding mutations in colorectal cancer, and more.