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A new study published in Nature shows that all that's needed to mend a "broken heart" is time — and stem cells, says Nature News' Marian Turner. The study shows that natural proteins can activate stem cells in mouse hearts to replace damaged muscle tissue after a heart attack, Turner says. Because cardiomyocytes can't be repaired after a heart attack, they need to be replaced.

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AstraZeneca has released its coronavirus vaccine trial protocol, according to the New York Times.

Time magazine looks into how liquid biopsies are changing cancer care.

According to the Guardian, more than 150 countries have signed on to a global SARS-CoV-2 vaccine plan.

In PNAS this week: similar muscle protein patterns across hypertrophic cardiomyopathy phenotypes, analysis of gene expression and brain anatomy in major depression, and more.