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The standard curves of the quadruplex real-time quantitative PCR assay. (A–D) Standard curves of the standard plasmid pMD-TTSuV1 (A), pMD-PCV2 (B), pMD-PRV (C), and pMD-PPV (D) at final reaction concentrations ranging from 1.0 × 10^9 to 1.0 × 10^2 copies/µL.
