 When a patient becomes aware of, you know, I'm not walking normally, or I'm having these weird hallucinations in some cases, or I've got a tremor in my left hand and I can't seem to stop it, well, yeah, you don't take a blood test and it comes up like you've got gonorrhea, you have Parkinson's. There are a number of tests that you undergo. And in its very infancy, when the signs are subtle, yes, it's difficult to diagnose, but as the doctor makes clear,