Participants received tacrolimus (extended-release formulation not permitted) within 30 days of transplant, dosed according to center’s standard of care. At 3-5 months post-transplant, participants were randomized and tacrolimus continued. Participants remained on an IMPDH inhibitor (MMF or MPS; switching between the two was permitted). Corticosteroids were maintained at a minimum of 2.5 mg/day of prednisone (or equivalent); withdrawal was prohibited after randomization. Participants received study drug during the post-randomization period for up to a maximum of 18 months post-transplant.