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An article in Technology Review takes a closer look at the nascent field of molecular imaging. Scientists at the NCI and the University of Tokyo designed a pH-sensitive fluorescent probe to seek out and grab on to specific receptors on a tumor's surface and light up only when the probe has made it inside a cancer cell. They tested the probe on HER2-positive tumors in mice and found that the probe detected tumors with 99 percent accuracy compared to an "always on" probe, which only detected 85 percent of the tumors.

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Moderna reports its vaccine is effective against new SARS-CoV-2 strains, though it is also developing a booster, according to the New York Times.

A new analysis suggests the B.1.1.7 strain of SARS-CoV-2 could be deadlier than previous ones, according to the Guardian.

NPR reports Merck is halting the development of its two candidate SARS-CoV-2 vaccines following disappointing Phase 1 results.

In PLOS this week: gene mutation linked to inherited venous thrombosis, lncRNA patterns in the Asian tiger mosquito, and more.