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But if those cells prove effective at healing the heart, she is hoping to test whether microgravity—even just a weeklong spin in the clinostat—could boost their powers further.

Transplant immunologist Mary Kearns-Jonker of Loma Linda University in California has been experimenting with simulated microgravity by sticking cardiac progenitor cells—tissue-specific stem cells that can develop into heart muscle—into a device called a clinostat, which rotates them constantly to minimize gravitational force.