In multiple sclerosis, for example, axons and neurons can die after myelin is lost as a result of the disease. 以多发性硬化症为例，疾病引起的髓鞘丧失，会造成轴突与神经的死亡。
The drug co-developers have already begun a clinical trial of Rituxan in a more severe form of the disease, primary progressive multiple sclerosis. 这种药物的联合开发者们已经开始在更加严重的多发性硬化患者里开展了临床试验，主要是进行性的多发性硬化病人。
