This Week in PNAS

In the early, online edition of the Proceedings of the National Academy of Sciences, an international research team catalogs the microRNAs present in more than a dozen human cell types. The researchers did short RNA sequencing on more than 1,300 samples representing 13 tissue types. Using this data, they tallied up more than 3,700 miRNAs not described previously, classifying new and known miRNAs based on their tissue-specificity.

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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.