Now, in addition, this plasma has also been modified, engineered in the following way. We essentially insert a small section known as a polylinker. And what a polylinker is, it's this region that we can cut by using restriction enzymes and we can place any type of DNA molecule into the polyinkerer by cutting it with a restriction enzyme. And so that's a very convenient property because if we have this polylinker, we can essentially insert any type of DNA fragment that we wish to. And once we insert that fragment, it will essentially inactivate this gene that codes for the beta galacticadase molecule. And if this gene is inactivated, then what that means is the cells that do uptake this plasmid will not have the ability to turn our solution blue.