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a Visual color changes of developed detection assay at different BVDV-RNA concentrations. Wells 1–7 contain 0, 1.64, 3.27, 6.55, 13.1, 26.2, and 52.4 ng/reaction of RNA respectively. b Plot of linear correlation (R2 = 0.992) of absorbance 520/620 nm ratio vs. different concentrations of viral RNA
