This Week in PNAS

In a paper published online in advance in PNAS this week, researchers at Mount Sinai School of Medicine in New York and the University of Illinois at Urbana-Champaign present "an experimental approach based on multicolor single-molecule fluorescent in situ hybridization to study the composition of viral RNAs at single-virus particle resolution." The team applied its FISH-based approach to determine the copy number of each RNA segment within individual virus particles for th

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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.