We take this divided by two and we get 35,000. So we see that in fact, this procedure has a high specific activity. And that makes sense because affinity Chromatography separates these enzymes based on their ability to bind to specific enzymes. And so in our mixture, when we run our mixture proteins along that column of that affinity chromatography setup, only the protein that we want to study will bind to our beads inside that column, the other proteins will essentially go down because enzymes only bind to specific types of proteins. And so that's why this is such a high value, because usually affinity chromatography separates by a very, very large margin. Now, what about the purification level?