4-Pyridone-3-carboxamide-1-β-D-ribonucleoside triphosphate (4PyTP), a novel NAD metabolite accumulating in erythrocytes of uremic children: a biomarker for a toxic NAD analogue in other tissues? - Synesiou E; Fairbanks LD; Simmonds HA; Slominska EM; Smolenski RT; Carrey EA (Toxins, 2011)