(A) Effect of pyruvate, oxaloacetate, lactate and malate addition on proliferation of HeLa Tet3G Luciferase cells in the presence of 200 µM uridine and in the presence or absence of 1 µM piericidin. Mean ± S.E., n=5 independent experiments. (B) Effect of LbNOX and mitoLbNOX expression in HeLa cells on inhibition of cell proliferation by 1 µM piericidin, 1 µM antimycin, 10 µg/ml chloramphenicol and 30 ng/ml ethidium bromide in the presence of 200 µM uridine. Mean ± S.E., n=3 independent experiments.