The blue gene basically codes for protein that gives the cell the ability to resist a special type of antibiotic known as tetracycline. While the green section codes for protein that allows the cell to remain resistant to the antibiotic ampicillin. And so together, these two genes give the cell the ability to resist antibiotics. Now, this section is basically the origin of replication. This is where replication essentially initiates. So remember, because circular DNA, unlike linear DNA, do not have a beginning and an end, we have to have the origin of replication position for the DNA polymerase to actually know where to begin the process of replication.