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Analysis by nuclease P1-enhanced 32P-postlabelling assay of DNA isolated from the white blood cells of 53 iron foundry workers was carried out independently in 3 laboratories, and the presence of aromatic DNA adducts was detected. The mean adduct levels in foundry workers varied from 9.2 +/- 23 (laboratory 3) and 12 +/- 10 (laboratory 2) to 26 +/- 43 (laboratory 1) and for the controls from 1.7 +/- 0.7 (laboratory 3) to 3.1 +/- 1.7 (laboratory 1) adducts per 10(8) nucleotides. No effect of smoking was observed in the present study. Each laboratory observed large interindividual variations of adduct levels. Good correlations were found between the results of the 32P-postlabelling assays carried out in the 3 laboratories; the correlation coefficients between laboratories 1 and 2, 1 and 3, and 2 and 3 were 0.61, 0.62, and 0.45, respectively, all being statistically highly significant (p less than 0.01). This interlaboratory comparison of the 32P-postlabelling method indicates the reproducibility of the method and its applicability in occupational exposure monitoring.
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