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Male gene sparks immune reaction to stem cell transplants from female donors

Researchers report that in some cases of stem cell transplants from female donors to male recipients, the transplanted cells mount an immunological attack against the product of a gene carried by most cells in the body of male recipients. Emmanuel Zorn, PhD, says it is the first time that the gene, located on the Y chromosome and known as DBY, has been identified following a female-to-male stem cell transplant for leukemia.