We have integral proteins and peripheral proteins. So what exactly is the difference between these two? Well, integral proteins are basically the proteins that remain permanently attached onto that membrane. And that's because these contain areas of hydrophobic regions that can actually interact with the core hydrophobic region of that membrane, as we'll see in our discussion in just a moment. On the other hand, peripheral proteins cannot interact as well with that hydrophobic core of the membrane. And so these peripheral proteins can actually dissociate under certain processes.