system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Multiple sclerosis is an autoimmune disease in which T-lymphocytes initiate an immune system response targeting the myelin sheaths of the central nervous system. What stage of T-lymphocyte development is the most likely to be defective in this disorder?
assistant
Negative selection