3p26.3, 3q21.1, 4q12, 6p25.3, 6q21, 9q34.3, 10p15, 11p15.5, 12q21.3, 16p13.3, 17q25.3,. Although none of these regions reaches the level of genome-wide significance, the number observed exceeds the 10 that would be expected by chance alone. Our results significantly add to the growing body of linkage data relating to multiple sclerosis.