The drug ketamine is sometimes used off-label to ease depression symptoms, although little is known about how it works. But a new study found that it blocks a specific brain receptor in mice, one that is different from those affected by traditional anti-depressants. (MSN)

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John Reynolds was the newsletters editor for the Tribune from 2013 to 2017. Prior to that, he was a reporter for Quorum Report, a non-partisan online political newsletter focusing on the ins and outs under...