In this photo taken, April 12, 2011, nurse Becki Maloney hugs stem cell donor Marshal Davis at Children's Memorial Hospital in Chicago as Jennifer Kowalik, and Michael Kowalik, the parents of Davis' ... more 
In this photo taken, April 12, 2011, nurse Becki Maloney hugs stem cell donor Marshal Davis at Children's Memorial Hospital in Chicago as Jennifer Kowalik, and Michael Kowalik, the parents of Davis' stem cell recipient. Davis was visiting the hospital with the Kowaliks to meet the staff that performed the transplant. The 31-year-old donor added his name to a bone marrow registry over a decade ago when he was a student at the University of Florida. He got the call to be a donor in 2009 when he was told he was nearly a perfect match with Jacob Kowalik, 7. Doctors said abnormalities in Jacob's marrow would eventually develop into acute leukemia without the transplant. less 
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Associated Press | Photo By M. Spencer Green
Sun, May 1, 2011 2:45 PM EDT