Our ViraSafe™ Lentiviral Packaging Systems contain three packaging plasmids for co-transfection with your own third generation lentiviral expression construct. If you need an expression vector as well as the packaging plasmids, consider our ViraSafe™ Lentiviral Expression Complete Systems. The Pantropic Packaging System assembles VSVG-pseudotyped lentiviruses which can easily infect virtually any cells regardless of their species of origin.