 So I wanted to just talk a little bit more about what happens inside the ribosome which has these two parts. Here's another diagram with the messenger RNA and it's showing the code, the C-A-C-G-G-A and it shows the tRNA, again with a nice molecular structure, with the code, the complementary code that matches down here, and the amino acid. And so the different tRNA molecules come in on this side and if they match the code they go into the position right here and as the messenger RNA comes through the protein jumps from one tRNA onto the next one adding one more amino acid to it. And then this tRNA diffuses away and this one likes the green amino acid, there are more green amino acids floating around, a new one attaches and then it can participate within the ribosome. So one of the cool things about the ribosome molecule and the whole assembly is that it has to create an environment where the correct tRNA molecule comes next to the mRNA and attaches and flips the polypeptide or protein to the next one. So all of these different molecular structures are designed to accurately translate the messenger RNA into the protein. And so each component of this is, the recipe for each component of this is stored in the organism's DNA. And so there's this really interesting process where through time and evolution the complexity of the molecules and their efficiency have been selected for, that they've built up bit by bit over time. And in fact we use some of the proteins within the ribosome to trace the evolution of life through time because these proteins are really optimized for the production of necessary parts of the cell, they remain stable through time.