And what that means is if that DNA polymerase actually uses the Ddatp to place this base, it will not be able to continue that DNA replication process because that molecule does not have the hydroxyl group that is needed to produce the phosphor diester bond with the next base. And so if this A comes from the Ddatp, this process will end and this will be the molecule that we will synthesize. And this is why we have fragment number one, molecule number one. Now, because we only have 1% of this Ddatp, this DNA polymerase will only sometimes use the Ddatp. Usually it's going to use the normal dATP molecule. And if it uses the normal dATP that contains the hydroxyl, then it will continue synthesizing those fossil diester bonds and so we can produce fragment number two.