So what I've outlined on the board is the pathway by which we essentially transform methionine into succinct coenzyme A. So this will be the focus of this lecture. We're not really going to look at valine or isolucine, but you should know that these amino acids can also be transformed into suclco enzyme A, just like methionine can. 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.