And now we take that and bring it into our bacterial cell. And notice when the bacterial cell reads this gene, the gene shown in red, it will produce the mRNA molecule that is already fully modified that only contains those exons and not the introns. And so now, because it doesn't have to worry about removing the introns and slicing together the exons and it doesn't have to worry about the polyatail or the five prime cap, it can easily synthesize that protein that we wanted to basically produce. And in this method we can produce any type of protein, an enzyme found inside our body. And that's why it is a very, very important procedure in the field of medicine. Now the question is how exactly one of the steps involved in producing the complementary double stranded DNA molecule that is complementary to this modified mature mRNA.