Figure 3From: The construction and characterization of the bi-directional promoter between pp38 gene and 1.8-kb mRNA transcripts of Marek's disease virusesComparisons of CAT expression levels in uninfected CEF or rMd5-infected CEF cells transfected with the plasmids including the bi-directional promoter from GA and CVI988. Transfected cells were harvested and lysed by 3 repeats of freeze and thraw The lysed samples were analyzed for CAT activity in 96-well plate of Roche's CAT ELISA kit. Each value represents the average of at least four independent transfections and significant differences were analyzed by student's test. *, p < 0.05.Back to article page