So now we essentially have these five beakers and in each one of these beakers we have a single type of gene. Now, the problem is we only have one of the genes, but to actually work with them, we have to have many copies of that gene. And so in the next few steps, what we actually want to do is we want to amplify make many copies of each one of these genes. And one way to do it is to use a plasmid. But the way we're going to do it in this lecture is by using a different type of vector, the vector we spoke about previously known as a lambda phage. Remember, a lambda phage is a bacteriophage that infects bacterial cells such as E. Coli cells.