Fig. 5From: Truncated Rep protein of porcine circovirus 2 (PCV2) caused by a naturally occurring mutation reduced virus replication in PK15 cellsThe viral titers of PCV2 from 3rd to 6th generation of serial passages was determined by IFA assay. The X-axis indicates the generations tested, while the Y-axis shows the viral titer as the logarithm of the TCID50 in the cell supernatants. **represents statistical significance P<0.01 among different groupsBack to article page