Now, once again, the sex Pillus is basically a hollow protein that connects one cell to the other cell, and it allows the transfer of our genetic information. So the donor cell, after it builds the cytoplasmic bridge, our sex pillars, then replicates its plasmid and transfers replicated plasmid to the other cell. Now, if the plasmid is in fact an f plasmid, then the recipient cell gains the ability to build the sex pilli and becomes a donor cell. So to see what we mean, let's take a look at the following diagram. So, we have the donor cell or the positive cell, the f positive, that contains this small circular f plasma shown in green. So when our two cells come in close proximity, this f plasmid is used to build the protein that is involved in the cytoplasmic bridge in the sex Pillus.