 That was a lot of structures today. This roughly covers chapters 11 and 13 and a bit of chapter 14 in Finkelstein. He goes into a lot of detail about tetraedra and helical stability, which is interesting if you're into the physics, but perhaps less important for the protein applications. Read it if you want to. As always, we've created a number of study questions for you that I look forward to discuss with those of you in Stockholm at least, and hopefully it will teach you both a little bit about peculiarities of protein structures, and in particular the super-secundary structure elements. One important thing when it comes to learning here, I don't expect you to know the exact details of, say, what the enzyme in the Tim barrel is doing or something. These names you can always look up, but what you should know by heart is things like the secondary structure elements. What is the Greek key? What is the Rosman fold? Because those will show up again and again and again, and you will hear a colleague saying that, oh, yeah, there is a typical Rosman fold motif here, or there is a Greek key secondary structure element, and life is going to be unbearable for you in this area of research if you constantly have to look up things like that. And in particular, if you don't recognize that, oh, that motif is a Rosman fold, you've seen that before. So make sure that you know the concepts by heart, but the specific applications for those, the name, is less important. Next lecture, we're going to head on to membrane proteins. That's going to be even more fun.