A new study provides insights on the mechanisms that allow an individual's immune system to accept, rather than reject, a donor kidney. The findings, which appear in an upcoming issue of the Journal of the American Society of Nephrology, point to markers that could be monitored to asses and track the health of organs following transplantation. A team led by Dr. Lorenzo Gallon (Northwestern University) and Valeria Mas (University of Virginia) studied patients in whom tolerance was induced by creating at state of persistent donor “chimerism.”