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In PLoS Genetics, a paper links genetic and fossil data. Robert Meredith from the University of California, Riverside, is first author on work that sequenced most of the protein-coding region of the enamelin gene in four different orders of placental mammals that lack teeth or have teeth without enamel. In all cases, they found frameshift mutations and/or stop codons that result in a mutated, dysfunctional form of the enamelin protein.

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The Wall Street Journal reports on gaps in COVID-19 testing affecting less affluent urban areas and rural locations.

According to NBC News, new SARS-CoV-2 variants are making it harder for researchers to model the course of the pandemic.

The New York Times reports that experts say President Joe Biden's goal of vaccinating 1 million people a day in the US in the next 100 days is too low a bar.

In Science this week: single-cell lineage tracing technique applied to study lung cancer metastasis, and more.