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![]() | Olivera, Baldomero M.; Hillyard, David R. | Pyridine nucleotide cycle: studies in Escherichia coli and the human cell line D98/AH2 | Different metabolic steps comprise the pyridine nucleotide cycles in Escherichia coli and in the human cell line HeLa D98/AH2. An analysis of the "P-labeling patterns in vivo reveals that in E. coli, pyrophosphate bond cleavage of intracellular NAD predominates, while in the human cell line, cleava... | Nicotinic acid; Turnover cycle; DNA ligation; Nicotinamide | 1981 |