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In PLoS Biology this week, investigators at MD Anderson Cancer Center and their collaborators show that "p53 plays an active role in promoting differentiation of human embryonic stem cells and opposing self-renewal by regulation of specific target genes and microRNAs." Further, the team writes, "p53 activates expression of miR-34a and miR-145, which in turn repress stem cell factors OCT4, KLF4, LIN28A, and SOX2 and prevent backsliding to pluripotency." and This study "under

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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.