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Bighorn sheep were introduced to Tiburón Island in the Gulf of California in 1975, as a conservation measure to restock mainland sheep whose numbers were declining. Before that, bighorn sheep weren't thought to live on the island, but a new study in PLOS One indicates that they may have lived there before.

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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.