The following link to a PubMed abstract contains the usual impenetrable jargon. Here is my attempt at translation:
Two of the amino acids on a ligand, (docking molecule), of myelin basic protein are in the wrong position. They are necessary to bind with receptors on the surface of T-cells so that the myelin is not mistaken as "foreign".
Because they do not engage correctly with the T-cell, the myelin basic protein is misrecognised.
Here is the abstract: