To ease shortage of organs, grow them in a lab?

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Growing Organs
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Growing Organs
Angela Irizarry, 5, is photographed at her home in Lewisburg, Pa. on Thursday, May 23, 2013. Angela was born in 2007 with a heart that had only one functional pumping chamber, a potentially lethal condition that leaves the body short of oxygen. So, over 12 hours one day, doctors took bone marrow from Angela and extracted certain cells, seeded them onto a 5-inch-long biodegradable tube, incubated them for two hours, and then implanted the graft into Angela to grow into a blood vessel. (AP Photo/Ralph Wilson)