Now, how exactly does the binding between the SRP ribosome complex and the membrane of our endoplasmic reticulum actually take place? So let's take a look at our Er membrane. So, this is the phospholipid bilayer of the Er membrane. So inside that Er membrane, we have a set of proteins that are known as the SRP receptor, where SRP stands for the signal recognition particles. So what happens is this entire SRP and SRP ribosome complex binds to the SRP receptor. And when that takes place, another type of membrane, known as another type of protein in the er membrane, known as translocon, basically opens up.