Adenosine nucleotides are added to our tail, to our end and that's exactly why it's known as the polya or the poly adenosine tail. Now let's move on to the final type of post transcriptional modification and this is known as the process of splicing. So we remove regions known as the introns and we combine the regions known as the axons. So not all regions of the premrname molecule code for our protein or proteins. Those regions that do code for the proteins are known as exons and those regions that do not code for the protein are known as introns. And so special types of enzymes that together are known as the splicosome basically remove our introns and split together or combine or glue our exons and we form the final mRNA molecules.