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Size distribution of particles in the dairy barns: airborne archaeal and bacterial concentrations 16S rRNA gene from dairy barn samples (average ± SEM), as determined by quantitative PCR. Comparison between the three NIOSH sampler stages (n = 13 each). LOD, 1 × 102 16S rRNA genes for archaea and 6 × 102 16S rRNA genes for bacteria. *, P < 0.005.
