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NEW YORK (GenomeWeb) – Researchers have uncovered 20 genetic loci that may explain why some people burn while others tan in response to sun exposure.

Whether or not someone can tan is determined by the ability of melanocytes to ramp up melanin production after exposure to ultraviolet radiation, and burning, rather than tanning, is a risk factor for developing skin cancer. In the US alone this year, about 91,270 new cases of melanoma are expected, according to the National Cancer Institute.

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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.