 that it works in two ways. One, 60% of our immune tissue is in our upper gut, in our small intestine. And there are special places in our small intestine called pirate's patches and M cells where if we eat, for instance, a shiitake mushroom, it's going to go down there. Those large beta-glucans are going to be recognized by macrophages that are circulating in those areas of our immune tissue in our upper gut.