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The viability observation of LLC-PK1 cells transfected with double-shRNA-N1-Mcherry during PDCoV infection. The cells were transfected with pSil-double-shRNA-N1-mCherry and then infected with PDCoV at an MOI of 0.1. At 36 hpi, the cell viability was calculated using the MTS assay, and the data are marked with three asterisks (***) if p < 0.001.
