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Sensitivity of triplex reverse-transcription PCR. M = marker DL2000; lanes 1–7 = copy numbers of re-cloned plasmids of PEDV and PSV at 107, 106, 105, 104, 103, 102, and 101/μL; SaV at 105, 104, 103, 102, 101, 10-1, and 10-2/μL respectively.
