| Type | MGI:General | Description | in spinal cord, less axons (23.2%) in mutants have lower sheath measurements than in wild-type (34.4%); mutant axons predominate in higher (13.6% at .65-.94 um; 10.6% at >.94%) compared to wild-type (4.5% and 1.4%, respectively); mutant axons are hypermyelinated |