DNA was isolated from peripheral blood collected from the donor and recipient prior to transplantation. Lymphocytes were isolated by centrifugation after red blood cell lysis. Isolated DNA was quantified at 260 nm absorbance. Single nucleotide polymorphisms were genotyped using a customized Affymetrix GeneChip and additional SNPs were measured using SNPlex (Applied Biosystems Inc, Foster City, California, USA) and Sequenom (Sequenom, Inc, San Diego, CA, USA) systems as previously described 19 (link). Candidate polymorphisms (n=88) measured in both the donor and recipient potentially relevant to mycophenolate metabolism, transport and mechanism of action were selected for this analysis (Table S1).