The slope will be zero, it will be a straight line. So we can see that this value, which is calculated by knowing this and the concentration can be used to basically determine if our sample is in fact pure. Now, in the next lecture, we're actually going to discuss how we purify our sample by beginning with our cell. Because if we want to study this particular enzyme, that enzyme, it's found in the cell. So the first question is before we even conduct our essay, how do we actually isolate the lactate dehydrogenase from that cell? What we have there is a process known as differential centrifugation.