and this is a picture just above the ears, horintal hotof e brai and normal myelin is black. and the scars of multiple sclerosis and the inflammation are in white. and here over the course of a few years one can see in the left upper corner the inflammation begin and then scar damage and regress and other areas begin and regress in other parts of the brain. we've learned from the mri that most of the activity in ms occurs below the surface. people don't have symptoms. they may feel unwell. fat agency is an important symptom but over the course of time this can lead to a progressive deagain rattive process. and the great news is that if we can stop the inflammation early we can protect people against this late degeneration. >> can you stop it in you can't detect it early enough? >> we, one needs to detect it in order to stop it. >> i think one of the wonderful things that has come along is the ability to visualize these lesions in the brain. this is only with the development of magnec resonancecentre imaging that one has been able to do this. >> how long before, in other words