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Haplogroup R1b (R-M343) is the most frequently occurring Y-chromosome haplogroup in Western Europe and the most common haplogroup in the genetic genealogy databases.R1b1a2 (R-M269) is the dominant branch of R1b in Western Europe.When you take a standard Y-chromosome DNA test with a company such as Family Tree DNA you will be given a base haplogroup assignment such as R1b1a2 (R-M269).n November 2012 Tim Janzen analysed a file of 1089 SNP-tested R-U106 haplotypes and 701 SNP-tested R-P312 haplotypes. He found that the modal (most common) allele values at 37 markers were the same for both R-U106 and R-P312 with the exception of these markers: DYS390, DYS576 and CDYa.
Abstract. Ethoxyresorufin-O-deethylase (EROD) activity is a biomarker of exposure to planar aromatic hydrocarbons, and it is often measured from the S9 fraction. The effect of the liver S9 fraction of seven boreal freshwater fish species on the fluorescence of resorufin was studied.he S9 fractions diminished resorufin fluorescence by 40â80%, and there were large differences between species. Thus, using a resorufin standard curve without the S9 fraction leads to a large underestimation of the EROD activity.