Although the data show no significant differences, the results for T c cytotoxic cells (CD8T) are consistently (in all years) on the borderline of significance.
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Individual DNA Methylation Pattern Shifts in Nanoparticles-Exposed Workers Analyzed in Four Consecutive Years.
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The sentences
Annual monitoring also showed a trend of decreasing NP exposure related to both processes (welding and grinding and milling) in sampling days over the years.