 This study will examine whether measurements of connective tissue growth factor CTGF and other cell proteins can identify which kidney transplant recipients are likely to develop chronic allograft nephropathy CAN, a disease of the transplanted kidney. CAN may occur months to years after the transplant. The kidney becomes progressively scarred and eventually loses all function, so that dialysis or another transplant is needed. A better understanding of how CTGF and other proteins are involved in the development of CAN may provide new targets for treating for the disease. 