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Abstract
N-Methyl- N′-nitro- N-nitrosoguanidine (MNNG) was found to induce an ultraweak photon emission in cultures of Chinese hamster fibroblasts (CHL). Measurements suggest that the light emission is due to a reaction between MNNG and cellular metabolites. The light emission depended on the concentration of MNNG and was oxygen-dependent, disappearing in a nitrogen atmosphere. Superoxide dismutase (SOD) or sodium azide decreased the emission intensity. The production of chromosomal aberrations in CHL by MNNG was correlated with the light emission intensity and was inhibited in the presence of SOD.
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