FRESNO, Calif. (KFSN) --

It's something Jon Galvan experienced five years ago after he almost died from a hemorrhagic stroke while atSubmit work.

"I was typing away and I felt a pop in my head," Galvan told Ivanhoe.

He was able to recover, but Abba Zubair, MD, PhD, Medical Director of Transfusion Medicine and Stem Cell Therapy at Mayo Clinic, Florida says not everyone is as fortunate.

"If it happens, you either recover completely or die," Dr. Zubair told Ivanhoe. "That's what killed my mother."

SubmitDr. Zubair wants to send bone marrow derived stem cells to the international space station.

"Based on our experience with bone marrow transplant you need about 200 to 500 million cells," Dr. Zubair said.

But conventionally grown stem cells take a month. Experiments on earth have shown that stem cells will grow faster in less gravity.

"Five to ten times faster, but it could be more," Dr. Zubair said.

Specifically he hopes to expand the number of stem cells that will help regeneration of neurons and blood vessels in hemorrhagic stroke patients.

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Growing Stem Cells in Space: Medicine's Next Big Thing?