So this is a retroviral vector. So it basically is our virus that contains these blue molecules. The blue molecules are a molecule called integrase and integrase is an enzyme that is used to actually incorporate that DNA molecule into the host cell's genome. We have these purple molecules which are the reverse transcriptase molecules which reverse transcribe the RNA into the DNA. And so when these green molecules, these dark green molecules are injected into that cell, these are the RNA molecules, this purple the reverse transcriptase, the purple enzyme basically creates this lighter green strand which is basically our DNA molecule and then this one also creates a DNA molecule. Those two DNA strands essentially combine to form a double helix DNA molecule and then that goes into the cell and the blue enzyme that integrates molecule now incorporates that into the host genome and that forms the proviral DNA.