So there are a total of nine steps that basically take us from methionine to succil coenzyme A. And so let's begin with step number one. And step number one is actually a very important step because it allows us to generate an important molecule that is used by the cells of our body. And we'll see what that molecule is and why it's important just in a moment. So let's first see how we actually get there. So we begin with aromthionine.