And by changing the sequences of nucleotides in the preexisting gene, we can in turn change what the sequence of amino acids is in the protein that is produced by that gene. And in certain cases, by changing the sequence of amino acids, we create brand new proteins that can contain brand new functions. So we see that recombinant DNA technology makes it possible to produce brand new proteins that have never been produced before, that contain brand new structures and have their own unique function. And we can do this by basically modifying the preexisting genes, by changing the nucleotide sequence in those genes that encode for certain proteins. Now, there are three types of modifications that we can commonly make to our gene. We can modify that gene by deleting a segment of DNA in that gene.