A phase III trial of obinutuzumab β shows striking efficacy in aquaporin-4-IgG-positive neuromyelitis optica spectrum disorder. The findings reinforce B cell depletion as a therapeutic principle while raising a more fundamental question: which B cell populations must be depleted, and how completely? This is a preview of subscription content, access via your institution Access Nature and 54 other Nature Portfolio journals Get Nature+, our best-value online-access subscription Receive 12 print issues and online access Prices may be subject to local taxes which are calculated during checkout Lennon, V.
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