This Week in Science

In this week's Science, a team of researchers from industry and academia report on how the deletion of a single microRNA from pluripotent stem cells enabled them to form both embryonic and non-embryonic lineages, revealing a role for the small, non-coding RNAs in regulating pluripotency. Specifically, when miR-34a was eliminated from embryonic stem cells, these engineered cells were able to generate both embryonic and extra-embryonic lineages.

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CNN reports that researchers have tied a new variant to opioid addiction risk.

Organoids derived from patients' tumors may help determine what chemotherapy treatment patients would benefit from, according to New Scientist.

An initiative from GenomeAsia 100K hopes to increase the number of South Asians in genetic research, according to NBC News.

In Science this week: genomic analysis of ancient and modern horses indicates population turnover, and more.