So we create a radioactively labeled DNA probe that has a complementary DNA sequence to that DNA fragment that we're looking for. And so what we do is we add the radioactively labeled DNA probe onto each one of these spots. And only that spot that contains that DNA fragment that we are looking for will create a hybrid with that radioactively labeled DNA molecule. And then we can take the results, we can transfer them onto a polymer sheet, and then we can take that polymer sheet and essentially expose it to the process of order radiography. And this will tell us exactly where that hybrid has formed. And so, for instance, at the antibiotics experiment, we know that within this spot, we have that DNA molecule that we actually want to amplify.