Fig. 1
From: A radical form of nitric oxide inhibits porcine circovirus type 2 replication in vitro
Cytotoxicity of SNP, VC and SNP plus VC on PK-15 cells tested by MTT assay. After incubation with the drugs for 72 h, MTT was added into each well. The cells were cultured for another 4 h and 200 μl DMSO was added into each well for dissolving formazan, then A570 of the samples were determined with a microplate reader (Sunrise, TECAN Co., Swiss). Relative viability was calculated according to the equation: Relative viability (%) = A570 of the drug-treated sample/A570 of the untreated sample × 100. Data shown were means ± SD from three independent experiments. Statistical significance was indicated in relation to the untreated control group: *P < 0.05, **P < 0.01