Impact of CSE blockade with PPG on cardiac allograft survival. The gray line represents survival of the rejection group without treatment (n = 6); dotted line, rats treated with NAL at 500 mg/kg per day alone (n = 5); and black line, rats treated with PPG at 50 mg/kg per day supplemented with NAL at 500 mg/kg per day (n = 6). **P < .01.