Now, an acetylation plays a crucial role in gene expression. Histones, those proteins that are involved in condensing our DNA into chromatids, can be meth or can be acetalylated, which reduces their ability to fold and opens up our DNA so that that DNA section can undergo the transcriptional process. Now, finally, the final process that we're going to discuss is lipidation. So lipidation is the process by which we add a lipid component onto our polypeptide chain. Now, why would we want to add a lipid component onto a polypeptide chain? Well, basically, those proteins that ultimately end up in a membrane, for example, the mitochondrial membrane, the endoplasmic reticulum membrane, or the plasma membrane, these proteins that end up on a membrane need to actually incorporate themselves into those membranes.