 So bacteria gets in. We've got viruses in our gut. So viruses start to come in. Sometimes there's fungus in there. There's parasites. There's toxins. There's gram-negative bacteria. There's all sorts of bad things that do not belong in the blood. And they come in, and they're supposed to get kept out. And so now they're coming in. And surprise, surprise, what ends up happening is we have a severe immune response.