Figure 2From: Generation of an infectious clone of HuN4-F112, an attenuated live vaccine strain of porcine reproductive and respiratory syndrome virusCytopathic effect (CPE) of the cloned virus in Marc-145 cells. Supernatants from the transfected BHK-21 cells obtained 24 h post-transfection were serially passaged on Marc-145 cells, at 72 h post-infection (p.i.), CPE was observed in rescued virus (A), while mock-infected cells remained normal (B).Back to article page