And that's what was the thought for many years because of the lactate. Even before glycolysis was invented, Meyerhoff, who discovered glycolysis, sometimes it's called Enden-Meierhoff pathway, which is glycolysis. Meyerhoff was a student of Warburg. Before they had even found out about glycolysis, the way they measure glycolysis is by measuring lactate. So they would measure how much lactate the cell produces and that's where they would say, "Wow, they're using a lot of glucose." But what he saw in cancer cells, there was an aberrant amount of lactate production and that was one of the things that struck Warburg the most.