So in the next step, what we want to basically do is we want to be able to distinguish between those bacterial cells that did take up those plasma and the ones that did not. And so what we do is we take all these plasmids and we take them and place them onto a special petri dish that contains not only a nutritious fluid but also antibiotic medium. And so what that means is once we place all these cells onto this antibiotic containing medium, those cells that took up these plasmids will have that blue gene that gives it resistance to those drugs and so they will not die off. But on the other hand, those cells that did not take up those plasmids will die off because they won't have that special blue gene. So this cell, this cell and this cell, because they did not take the plasmids, they will basically die off. But this cell, this cell, this cell and this cell, because they have these blue genes that gives them the resistance to antibiotics, they will not die off.