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Int1 abundance in response to arsenic concentration. Relative abundance of int1 is taken as the proportion of int1 copies per 16S rRNA copies, where copy numbers are calculated using standard curves and qPCR. Error bars are ± standard error. Quadratic model suggests highest arsenic concentration (100 ppb) significantly increased int1 abundance (F(2,14) = 13.27; P < 0.01).
