And because this DNA is complementary to the mRNA, this complementary DNA will no longer contain these orange sections, these intron sections, it will only contain the sequence of nucleotides that corresponds to these exons sections. So now we heat this double stranded molecule and we separate the mRNA and the DNA. Remember, this DNA is complementary to this mRNA. And so if we take this DNA molecule and we place it inside a eukaryotic cell, it will be able to use this complementary DNA molecule to synthesize the proteins because it won't have to worry about those introns, because those introns were removed in this process inside the eukaryotic cell. Now, because single stranded DNA molecules are less stable than double stranded DNA molecules, what we have to do is we have to take the single stranded DNA molecule, mix it with DNA polymerase to form the more stable double stranded complementary DNA molecule. Now, this process is done with a single eukaryotic gene, but we can carry out with many different types of genes within that eukaryotic organism.