And because of that, we call them glucogenic. Remember, inside our liver, we can transform Pyruvate into oxylacetate, and then the oxyloacetate is transformed into glucose via glucaniogenesis, and that's why we call them glucogenic. Now, some of these are actually ketogenic as well, but let's not talk about that. So let's begin with cystine. So we see that Cysteine Alanine Tryptophan, glycine, serene and threatening can all be transformed into Pyruvate. So let's begin with cysteine.