For example, disruption of MHC class I function by deletion of β 2 -microglobulin in SJL/J mice results in more demyelination and increased neurological deficit (Begolka et al., 2001) , and in the SJL/J strain it has been suggested that MHC class II-restricted T-cell response (Miller et al., 1987) , and epitope-spreading to myelin antigens may be the mechanism of demyelination and neurological deficit (Croxford et al., 2002; Miller et al., 1997) .