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In Focus

Blood Gets an Upgrade

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The long search for a blood substitute could take a major step forward this year.

Each year, donors step up to replenish the nation’s blood supply. Depending on volunteers for this critical resource, however, has never been ideal. The units that come in must be screened for diseases—including nascent threats, such as the Zika virus. And what volunteers can supply may not match the demand, especially for people with rare blood-group types ...

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