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In the PNAS Early Edition this week, a team led by researchers at the University of Nebraska-Lincoln shows that "individuality in gut microbiota composition is a complex polygenic trait shaped by multiple environmental and host genetic factors." Namely, using quantitative pyrosequencing of the microbiota in 645 intercross line mice, the team found a core measurable microbiota of 64 taxonomic groups, within which they identified "co-segregation with 530 fully informative SNP markers" and "18 host quantitative trait loci that show significant or suggestive genome-wide linkage with re

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The World Health Organization will be providing low-cost COVID-19 tests to low- and middle-income nations, according to Reuters.

Nature News examines how the confirmation of Amy Coney Barrett to the US Supreme Court could affect scientific agencies.

Nobel Prize-winner Arthur Ashkin, who developed optical tweezers, has died at 98, the Washington Post reports.

In PNAS this week: altered gene expression in brain samples from Alzheimer's disease patients, effects of gene mutations found in bladder cancer, and more.