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. Now, the conversion of cysteine into Pyruvate is actually pretty complicated because there are several different pathways by which cysteine can be transformed into Pyruvate. So we're not going to look at the details of those steps or those pathways. But I will mention that in the conversion of cysteine to Pyruvate, we have to somehow remove this sulfur atom.