This Week in PNAS

In the early, online edition of the Proceedings of the National Academy of Sciences, Los Alamos National Lab researchers explore phylogenetic patterns that may appear when trying to untangle disease transmission dynamics in an epidemiological investigation. The team used a mathematical framework called coalescent theory to come up with half a dozen phylogenetic tree topologies using HIV-1 sequences from two individuals suspected of being epidemiologically linked.

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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.